Conductivity Sensors | McMaster-Carr

Don’t worry about dropping this meter in your tank when checking electrical conductivity—it floats and has a housing that meets IP67 for complete resistance to dust and protection from temporary submersion. For use with water, hydroponic solutions, and other clean liquids, this meter measures a liquid's conductivity to indicate the concentration of salts, nutrients, chemicals, and other substances. It displays temperature in addition to conductivity. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters
	Conductivity								Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
304 Stainless Steel	0 to 1,999 µS	±1.5%	32° to 122°	IP67	CE Marked	Yes	00000000	000000	00000000	000000

Remote-Reading Conductivity Meters

View conductivity readings of wastewater, boiler condensate, aquaculture solutions, and other dirty liquids up to 3 feet from the remote sensor to indicate the concentration of salts, nutrients, chemicals, and other substances. This meter has automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy. Meter cannot be sold to Canada due to import regulations.

Meters
	Conductivity								Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Specifications Met	Batteries Included	Cannot Be Sold To		Each		Each
For Use With Dirty Liquids
Nonglass	0 to 20 µS 0 to 200 µS 0 to 2,000 µS 0 to 20 mS 0 to 200 mS	±1%	32° to 122°	CE Marked	Yes	Canada	0000000	0000000	0000000	0000000

Bench-Top Conductivity Meters

Pour contaminated water, wastewater, printing fountain solutions, and other dirty liquids into the meter cup to test electrical conductivity levels that indicate the concentration of salts, nutrients, chemicals, and other substances. These meters have automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration knob to maintain accuracy.

	Conductivity
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Ht.	Wd.	Dp.	Batteries Included		Each
For Use With Dirty Liquids
Nonglass	0 to 0.5 µS 0 to 5 µS 0 to 50 µS 0 to 500 µS 0 to 5,000 µS	±2%	32° to 120°	4"	3 1/2"	4 1/2"	Yes	0000000	0000000
Nonglass	0 to 10 µS 0 to 100 µS 0 to 1,000 µS 0 to 10,000 µS	±2%	50° to 160°	4"	3 1/2"	4 1/2"	Yes	00000000	000000

Optional Carrying Case

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Each

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Water-Resistant pH Meters

Check pH in harsh field conditions. These floating meters that have a housing that meets IP67 for complete resistance to dust and protection from temporary submersion. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a calibration solution and the calibration button to maintain accuracy. They do not include Calibration Solution. Meters cannot be sold to Canada due to import regulations.

Meter for clean liquids is commonly used in pools and hydroponic solutions.

Meter for dirty liquids stands up to wastewater, plating bath solutions, and other harsh liquids.

Meters
	pH									Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included	Cannot Be Sold To		Each		Each
For Use With Clean Liquids
Glass	0 to 14 pH	±0.1 pH	32° to 122°	IP67	CE Marked	Yes	Canada	00000000	000000	000000	00
For Use With Dirty Liquids
Glass	-2 to 16 pH	±0.01 pH	32° to 122°	IP67	CE Marked	Yes	Canada	00000000	00000	00000000	000000

Remote-Reading pH Meters with PC Output

Transmit pH readings to a PC for analysis. This meter has a sensor on a 3-ft. cable for taking remote readings of water and other clean liquids. It has automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate readings in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters
	pH							Replacement Sensors
Sensor Material	pH Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
Glass	0 to 14 pH	±0.01 pH	14° to 212°	CE Marked	Yes	00000000	0000000	00000000	0000000

Remote-Reading pH Meters

Meter for Clean Liquids

Meter for Dirty Liquids

The remote sensor with a cable lets you take pH readings in hard-to-reach areas. Use a Calibration Solution and the calibration button to maintain accuracy. Meter for dirty liquids includes calibration solution; meter for clean liquids does not include calibration solution.

Nonglass sensors are more durable and resistant to breakage than glass sensors.

Meter for clean liquids is often used to check water quality.

Meter for dirty liquids stands up to use in petrochemical, environmental, and agricultural testing. The water-resistant housing meets IP65 for protection from dust and low-pressure washdowns. It cannot be sold to California due to energy regulations or to Canada due to import regulations.

Meters
	pH									Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included	Cannot Be Sold To		Each		Each
For Use With Clean Liquids
Glass	0 to 14 pH	±0.01 pH	32° to 212°	__	CE Marked	Yes	__	0000000	0000000	0000000	0000000
For Use With Dirty Liquids
Nonglass	0 to 14 pH	±0.01 pH	20° to 250°	IP65	CE Marked	Yes	CA, Canada	0000000	00000000	0000000	000000

pH Meters

More precise than test strips, these meters are often used to measure the pH of dirty liquids in agricultural systems, aquaculture tanks, and printing fountains. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy. Meters cannot be sold to Canada due to import regulations.

	pH
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Batteries Included	Cannot Be Sold To		Each
For Use With Dirty Liquids
Glass	0 to 14 pH	±0.1 pH	32° to 122°	Yes	Canada	0000000	000000

Remote-Reading TDS Meters

The remote probe on a 3-ft. cable limits your exposure when taking total dissolved solids (TDS) measurements to determine contaminant levels in aquaculture solutions, boiler condensate, contaminated water, and other dirty liquids. This meter has automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters
	Total Dissolved Solids (TDS)							Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Specifications Met	Batteries Included		Each		Each
For Use With Dirty Liquids
Nonglass	0 to 10 ppm 10 to 100 ppm 100 to 1,000 ppm 1 to 10 ppt 10 to 100 ppt 100 to 200 ppt	±1%	32° to 122°	CE Marked	Yes	0000000	0000000	0000000	0000000

Water-Resistant TDS Meters

Since these meters float and have a housing that meets IP67, they won’t be damaged by temporary submersion and have complete resistance to dust. They detect total dissolved solids (TDS) in water, hydroponic solutions, and other clean liquids to determine contaminant levels. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters
	Total Dissolved Solids (TDS)								Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
304 Stainless Steel	0 to 1,000 ppm	±1.5%	32° to 122°	IP67	CE Marked	Yes	00000000	000000	00000000	000000

ORP Meters

Measure a solution’s oxidation reduction potential (ORP) to determine its ability to break down contaminants. These meters are commonly used to monitor water quality in pools, spas, and other clean liquids. Use a Calibration Solution (not included) and the calibration adjustment screw to maintain accuracy. Meters cannot be sold to Canada due to import regulations.

	Oxidation Reduction Potential (ORP)
Sensor Material	Range	Accuracy	Batteries Included	Cannot Be Sold To		Each
For Use With Dirty Liquids
Nonglass	-999 to 999 mV	±2 mV	Yes	Canada	0000000	000000

Water-Resistant ORP Meters

Since this oxidation reduction potential (ORP) meter has a housing that meets IP67 for complete resistance to dust and protection from temporary submersion, it’s often used to determine a solution’s ability to break down contaminants in harsh field conditions. For use with dirty liquids containing heavy metals, sulfides, and harsh chemicals, this meter is often used for wastewater treatment. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy. Meters cannot be sold to Canada due to import regulations.

Meters
	Oxidation Reduction Potential (ORP)									Replacement Sensors
Sensor Material	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included	Cannot Be Sold To		Each		Each
For Use With Dirty Liquids
Glass	-1,000 to 1,000 mV	±2 mV	32° to 140°	IP67	CE Marked	Yes	Canada	00000000	0000000	00000000	0000000

Easy-Read Bench-Top Multifunction Chemistry Meters

Don’t strain your eyes reading a scale—these bench-top meters indicate exact results on the digital display. For complete resistance to dust and protection from temporary submersion, these meters float and have a housing that meets NEMA 6 and IP67. They're for use with water and other clean liquids. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters								Replacement Sensors
For Testing	Sensor Material	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
Conductivity, Resistivity, Total Dissolved Solids (TDS)	Nonglass	32° to 160°	IP67, NEMA 6	CE Marked	Yes	000000	0000000	000000	00
Conductivity, Oxidation Reduction Potential (ORP), pH, Resistivity, Total Dissolved Solids (TDS)	Glass	32° to 160°	IP67, NEMA 6	CE Marked	Yes	000000	00000000	000000	0000000

Remote-Reading Multifunction Chemistry Meters with PC Output

Upload up to 500 conductivity and total dissolved solids (TDS) readings to a PC. This meter has a probe on a 3-ft. cable for taking readings in hard-to-reach areas. It's for use with tap water, pool water, hydroponic solutions, and other clean liquids. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Data hold freezes the current reading on the display. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

Meters
	Conductivity		Total Dissolved Solids (TDS)							Replacement Sensors
Sensor Material	Range	Accuracy	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
Nonglass	0 to 19.99 µS 0 to 199.9 µS 0 to 1,999 µS 0 to 19.99 mho 0 to 199.9 mho	±1%	0 to 9.99 ppm 10 to 99.9 ppm 100 to 999 ppm 1 to 9.99 ppt 10 to 99.9 ppt	±1%	-17° to 230°	CE Marked	Yes	00000000	0000000	00000000	0000000

Remote-Reading Multifunction Chemistry Meters

Remote sensors let you take pH and oxidation reduction potential (ORP) readings up to 3 feet from the display. For use with clean liquids, this meter is often used for water-quality testing. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration button to maintain accuracy.

	pH		Oxidation Reduction Potential (ORP)
Sensor Material	Range	Accuracy	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Specifications Met	Batteries Included		Each
For Use With Clean Liquids
Glass	0 to 14 pH	±0.01 pH	-1,000 to 1,000 mV	±2 mV	32° to 212°	CE Marked	Yes	0000000	0000000

Replacement sensor for testing Oxidation Reduction Potential (ORP)

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Water-Resistant Multifunction Chemistry Meters

For Use with
Clean
Liquids

For Use
with Clean
and Dirty Liquids

Test different water-chemistry measurements in dirty, wet conditions. Often used in pools and spas, all of these meters are for use with clean liquids. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a calibration solution (not included) and the calibration button to maintain accuracy.

IP57 meters are protected from dust and temporary submersion in liquids.

IP65 meters are protected from dust and low-pressure jets of liquids.

Chlorine, oxidation reduction potential (ORP), and pH meters come with three sensors that each take one chemistry measurement. They cannot be sold to Canada due to import regulations.

Conductivity, salinity, and total dissolved solids (TDS) meters come with one sensor that takes all three chemistry measurements.

Conductivity and total dissolved solids (TDS) meters come with one sensor that takes both chemistry measurements. You can also use them in aquaculture solutions, wastewater, and other dirty liquids. They cannot be sold to Canada due to import regulations.

For Testing Chlorine, Oxidation Reduction Potential (ORP), and pH

For Use With Clean Liquids
Sensor Material	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included	Cannot Be Sold To		Each
Glass	23° to 194°	IP57	CE Marked	Yes	Canada	0000000	0000000

Replacement Sensor for Testing pH	Each	000000
Replacement Sensor for Testing Chlorine	Each	000000
Replacement Sensor for Testing Oxidation Reduction Potential (ORP)	Each	00000

For Testing Conductivity, Salinity, and Total Dissolved Solids (TDS)

Meters							Replacement Sensors
Sensor Material	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included		Each		Each
For Use With Clean Liquids
Nonglass	32° to 149°	IP57	CE Marked	Yes	00000000	0000000	00000000	000000

For Testing Conductivity and Total Dissolved Solids (TDS)

For Use With Clean and Dirty Liquids
Sensor Material	Automatic Temperature Compensation (ATC) Range, °F	Environmental Rating	Specifications Met	Batteries Included	Cannot Be Sold To		Each
Nonglass	32° to 122°	IP65	CE Marked	Yes	Canada	0000000	000000

Bench-Top Multifunction Chemistry Meters

Check the pH and conductivity of water and other clean liquids with one bench-top device. This meter has automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. Use a Calibration Solution (not included) and the calibration knob to maintain accuracy.

Meters
	pH		Conductivity									Replacement Sensors
Sensor Material	Range	Accuracy	Range	Accuracy	Automatic Temperature Compensation (ATC) Range, °F	Ht.	Wd.	Dp.	Batteries Included		Each		Each
For Use With Clean Liquids
Glass	2-12 pH	±0.2 pH	0 to 10 µS 0 to 100 µS 0 to 1,000 µS 0 to 10,000 µS	±2%	50° to 160°	4"	3 1/2"	4 1/2"	Yes	00000000	0000000	00000000	0000000

Chemistry Controllers

Controller

Adapter

Sensor

Turn pumps, mixers, valves, and other equipment on or off based on the pH or conductivity of a solution. These controllers compare input from a sensor (sold separately) to a programmed actuation point and turn equipment on or off when the reading reaches the actuation point. They have two control relays. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures.

Controllers for testing pH also require an adapter.

For Testing pH

Controllers
pH													Sensors		Adapters
Range	Accuracy	Actuation Points	Actuation Tolerance	AC Voltage (Phase)	Ht.	Wd.	Dp.	Mounting Location	Mounting Hole Dia. (No. of)	Fasteners Included		Each		Each		Each
LCD Display
0.0 to 14.0 pH	±0.01 pH	2	0.00 to 1.00 pH	120 (Single)	3 3/4"	3 3/4"	2 3/4"	Panel, Wall	5mm (2)	Yes	00000000	0000000	000000000	0000000	000000000	000000

For Testing Conductivity

Controllers
Conductivity													Sensors
Range	Accuracy	Actuation Points	Actuation Tolerance	AC Voltage (Phase)	Ht.	Wd.	Dp.	Mounting Location	Mounting Hole Dia. (No. of)	Fasteners Included		Each		Each
LCD Display
0 to 2 µS 0 to 20 µS 0 to 200 µS 0 to 2,000 µS 0 to 20 mS 0 to 200 mS	±1%	2	0 to .2 µS 0 to 2 µS 0 to 20 µS 0 to 200 µS 0 to 2 mS 0 to 20 mS	120 (Single)	3 3/4"	5"	2 1/2"	Panel, Wall	5mm (2)	Yes	00000000	0000000	000000000	0000000

Multifunction Chemistry Controllers

LCD Display

LED Display

The same controller can actuate equipment based on pH or oxidation reduction potential (ORP). Attach pH and ORP sensors (not included) and set the current measurement type with the selection switch. Controllers turn equipment on or off when the reading reaches the actuation point. They have one control relay and two alarm relays. Relays are single pole, double throw (SPDT) and can be set to turn one circuit from “off” to “on” (normally open) or from “on” to “off” (normally closed). Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures.

Controller with LED display is more visible in low-light conditions than controller with LCD display.

	pH		Oxidation Reduction Potential (ORP)
DIN Trade Size	Range	Accuracy	Range	Accuracy	AC Voltage (Phase)	Mount Type	Ht.	Wd.	Dp.	Fasteners Included		Each
LCD Display
1/4	0.0 to 14.0 pH	±0.01 pH	-1,999 to 1,999mV	±0.1%	120 (Single)	Panel	3 3/4"	3 3/4"	4 3/4"	No	00000000	0000000
LED Display
1/4	0.0 to 14.0 pH	±0.01 pH	-1,999 to 1,999mV	±0.1%	120 (Single)	Panel	3 3/4"	3 3/4"	4 3/4"	No	00000000	000000

Water-Quality Combination Test Kits

Test for contaminants before installing water-treatment equipment such as boilers and filters. You can also check your pipes and equipment for improper chemical levels that can cause corrosion and scale buildup, shortening their life.

340-test kits include tests for monitoring municipal water, which is often treated with chlorine.

290-test kits include tests that help you monitor well water, which often contains sulfur compounds.

Test Kits						Refill Chemicals
For Testing	Range	Test Type	Number of Tests		Each		Each
340-test kits
Hardness Iron Chlorine pH Total Dissolved Solids (TDS)	Total; 0-30 gpg 1-5 ppm Total; 0.1-2.0 ppm 5 to 10 pH 0-9,990 ppm	Analog Analog Analog Analog Digital	120 50 50 120	0000000	0000000	0000000	000000
290-test kits
Hardness Iron Hydrogen Sulfide, Sulfide Total Dissolved Solids (TDS)	Total; 0-30 gpg 1-5 ppm 0.2-5.0 ppm 0-9,990 ppm	Analog Analog Analog Digital	120 50 120	0000000	000000	0000000	00000

Sanitary Conductivity Sensors

Sensor

Three-Color Display

Optional Quick-Clamp Adapter

Test for chemicals, cleaners, and other substances in your sanitary line by measuring how well the liquid conducts electricity. These sensors are highly accurate over a wide conductivity range, so you can use them with almost any liquid or process. They’re certified by 3-A and by the European Hygienic Engineering and Design Group (EHEDG) to meet sanitary design standards.

Rated IP69K, these sensors hold up to high-temperature, high-pressure washdowns. They’re also rated IP67, so they can be submerged in water for up to 30 minutes. These sensors are often used to save water after clean-in-place (CIP) cycles by determining when the rinse water is free of chemicals and cleaners. Made from 304 stainless steel, the body won’t corrode from frequent washdowns with harsh cleaners. The sensor probe is PEEK, which won’t degrade from chemicals and high temperatures—it’s also FDA compliant for safe contact with food. Any parts that contact liquids are polished to extreme smoothness, so bacteria has nowhere to hide.

Program these sensors with the touchscreen, and select one of three background colors as a visual alert for errors, completed cycles, and other events in your process. The head swivels 345° and the face rotates all the way around, so you can mount the sensor at any angle and still see the display. They have automatic temperature compensation (ATC) that standardizes readings at 77° F (or the temperature you choose) to give accurate results, even in fluctuating temperatures. Since they also measure temperature, you don’t need a separate temperature sensor on your line.

You can also connect these sensors to remote displays and programmable logic controllers (PLCs) with the M12 plugs. Programming these sensors remotely makes frequent application changes easier, and lets you measure liquids in hard-to-reach areas. They’re compatible with IO-Link, HART, and 4-20 mA analog outputs, so you can use them with existing systems. They’re often used to trigger the beginning or end of a cycle in automated systems, or to check the concentration of chemicals in pharmaceutical applications. These sensors are CE Marked, which means they meet safety standards created by the European Union.

Use a quick-clamp adapter to connect these sensors to quick-clamp sanitary tube fittings on your line.

For technical drawings and 3-D models, click on a part number.

	Sensor			Conductivity
Lg., mm	Material	Dia., mm	Lg., mm	Range	Accuracy	Electrical Connection Type	Thread Type	Automatic Temp. Compensation (ATC) Range, °F	Environmental Rating	Specifications Met		Each
For Use With Liquids
37	PEEK Plastic	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 µS	±1.5% ±1% ±1.5%	Threaded M12 Plug (One 4-Pole Connection and One 5-Pole Connection)	BSPP	-4° to 302°	IP67, IP69K	3-A Certified 74-07, CE Marked, EHEDG Certified, FDA Compliant 21 CFR 177.2415	0000000	000000000
60	PEEK Plastic	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 µS	±1.5% ±1% ±1.5%	Threaded M12 Plug (One 4-Pole Connection and One 5-Pole Connection)	BSPP	-4° to 302°	IP67, IP69K	3-A Certified 74-07, CE Marked, EHEDG Certified, FDA Compliant 21 CFR 177.2415	0000000	00000000
83	PEEK Plastic	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 µS	±1.5% ±1% ±1.5%	Threaded M12 Plug (One 4-Pole Connection and One 5-Pole Connection)	BSPP	-4° to 302°	IP67, IP69K	3-A Certified 74-07, CE Marked, EHEDG Certified, FDA Compliant 21 CFR 177.2415	0000000	00000000

Optional Quick-Clamp Adapter

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