Conductivity Testers | McMaster-Carr

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Conductivity

Oxidation Reduction Potential (ORP)

Resistivity

Salinity

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Total Dissolved Solids (TDS)

System of Measurement

Battery Voltage

Minimum Conductivity

For Use With

For Calibrating

Total Dissolved Solids (TDS)

Meter Type

Measures

Height

Maximum Total Dissolved Solids (TDS)

Display Type

Conductivity Resolution

REACH

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Battery Cell Type

Calibration Point

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RoHS

Conductivity Accuracy

±1%

±1.5%

±2%

±0.5% Full Scale ±1 Digit

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

Conductivity Range

DFARS Specialty Metals

Maximum Salinity

Sensor Material

32 Products

Water-Resistant Multifunction Chemistry Meters

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. They meet IP57 for protection from dust and temporary submersion in 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.

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

Conductivity, salinity, and total dissolved solids (TDS) meters come with one sensor that takes all three chemistry measurements. You can also use them in aquaculture solutions, wastewater, and other dirty liquids.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Conductivity		Salinity		Total Dissolved Solids (TDS)
	Sensor Material	Range	Accuracy	Range, ppm	Accuracy	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean and Dirty Liquids



		Plastic	0 to 199.9 μS 200 to 1,999 μS 2 to 19.99 mS	±2%	0 to 99.9	±2%	0 to 99.9 ppm 100 to 999 ppm 1 to 9.99 ppt	±2%	32 to 149	IP57	CE Marked	6 3/4"	1 3/8"	1 5/8"	Yes	Canada	LCD	00000000	0000000

Replacement Sensors

For Testing		Each
Conductivity, Salinity, Total Dissolved Solids (TDS)	00000000	000000

DC Voltage and Conductivity Testers for Large-Cell Batteries

Measure the voltage of your batteries as well as the current they can supply to check battery health.

	For Battery Voltage, V DC	For Battery 20 hr. Rate Cap. Range, A·h	Measurement Unit	Voltage, V DC	Conductivity, S	Display Type	Digital Display Type	Includes	Ht.	Wd.	Dp.		Each
For Dry-Cell AGM Lead Acid and Wet-Cell Lead Acid Batteries



	Rechargeable	6/12	1.2 to 55	Siemens, Volts	6 to 14	20 to 1,200	Digital	LED	12" Leads with Sheathed Alligator Clips	7 1/2"	3 1/2"	2"	0000000	0000000

Conductivity Controllers


Controller	Sensor

Turn pumps, mixers, valves, and other equipment on or off based on the conductivity of a solution. These controllers compare input from a sensor (sold separately) to a programmed actuation point and react when the reading reaches the actuation point. They’re often used in water treatment and electroplating. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures.

Mechanical Relay Output—Controllers with mechanical relay output directly turn equipment on or off with two SPDT (single pole, double throw) relays.

Analog Output—Controllers with analog output send 4-20mA signals to a PLC or other receiving device (not included) to record data and control equipment.

	Conductivity Controllers															Sensors
				Conductivity
	No. of Control Relays	Output Current, mA	Switch Designation	Range	Accuracy	Actuation Points	Tolerance	Input Voltage, V AC	Ht.	Wd.	Dp.	Mounting Location	For DIN Panel Cutout Size		Each		Each
Mechanical Relay Output







				LCD Display

				2	—	SPDT	0 to 2 μS 2 to 20 μS 20 to 200 μS 200 to 2,000 μS 2 to 20 mS	±0.5% Full Scale ±1 Digit	2	0 to 0.2 μS 0 to 2 μS 0 to 20 μS 0 to 200 μS 0 to 2 mS	100 to 240	1 3/4"	3 3/4"	4 3/4"	Panel, Wall	1/8	00000000	0000000	000000000	0000000


				Analog Output







								LCD Display

								—	4 to 20	—	0 to 2 μS 2 to 20 μS 20 to 200 μS 200 to 2,000 μS 2 to 20 mS	±0.5% Full Scale ±1 Digit	2	0 to 0.2 μS 0 to 2 μS 0 to 20 μS 0 to 200 μS 0 to 2 mS	100 to 240	1 3/4"	3 3/4"	4 3/4"	Panel, Wall	1/8	000000000	000000	000000000	000000

Remote-Reading Multifunction Chemistry Meters

Take multiple water-chemistry and temperature measurements in hard-to-reach places from up to 3 feet away. Often used in tap water and wastewater, these meters work in both clean and dirty liquids. Automatic temperature compensation standardizes readings to 77° F to prevent inaccurate results in changing temperatures. The data hold function freezes the current reading on the display. For easy viewing, temperature and chemistry measurements appear on the same screen. These meters are IP57 rated, so they resist dust and withstand temporary submersion.

To maintain their accuracy, all have a calibration button and some also come with calibration solutions.

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

Image of Product. Front orientation. Chemistry Meters. Remote-Reading Multifunction Chemistry Meters , For Testing Total Dissolved Solids (TDS).

Conductivity, salinity, temperature, and total dissolved solids (TDS) meters take four measurements at once. Conductivity measures the concentration of salts, nutrients, chemicals, and other substances. Salinity measures the amount of dissolved salts. TDS determines the contaminant levels. The stainless steel sensor is durable and resists breaking.

Cannot Be Sold to Canada—Meters cannot be sold to Canada due to import regulations.

	Conductivity		Salinity			Total Dissolved Solids (TDS)
	Range	Accuracy	Range, ppt	Accuracy	Temp. Accuracy	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean and Dirty Liquids



		0 to 19.99 μS 20 to 199.9 μS 200 to 1,999 μS 2 to 19.99 mS 20 to 199.9 mS	±1% ±1% ±1% ±1% ±1%	0 to 100	±1%	±0.9° F	0 ppm to 0.1 ppm	±1%	32 to 212	IP57	CE Marked	7 1/2"	3 9/16"	1 5/16"	Yes	Canada	LCD	0000000	0000000

Replacement Sensors

For Testing		Each
Conductivity, Salinity, Temperature, Total Dissolved Solids (TDS)	0000000	0000000

Water-Resistant Conductivity Meters

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.

For Testing Conductivity

Image of Product. Front orientation. Chemistry Meters. Water-Resistant Conductivity Meters.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Conductivity
	Sensor Material	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean Liquids



		304 Stainless Steel	0 μS to 1,999 μS	±1.5%	32 to 122	IP67	CE Marked	7 3/8"	1 7/8"	1 1/2"	Yes	Canada	LCD	00000000	0000000

Replacement Sensors

	Each
00000000	000000

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.

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

Image of Product. Front orientation. Chemistry Meters. Easy-Read Bench-Top Multifunction Chemistry Meters .

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Conductivity		Resistivity		Total Dissolved Solids (TDS)
	Sensor Material	Range	Accuracy	Range	Accuracy	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean Liquids



		Plastic	0 to 9,999 μS 10 to 200 S	±1%	10 kohm to 30 Mohm	±1%	0 to 9,999 ppm 10 to 200 ppt	±1%	32 to 160	IP67, NEMA 6	CE Marked	2 1/2"	2 3/4"	7 3/4"	Yes	Canada	LCD	000000	0000000

For Testing Conductivity, Oxidation Reduction Potential (ORP), pH, Resistivity, and Total Dissolved Solids (TDS)

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Conductivity		Resistivity		Oxidation Reduction Potential (ORP)		pH		Total Dissolved Solids (TDS)
	Sensor Material	Range	Accuracy	Range	Accuracy	Range, mV	Accuracy	Range, pH	Accuracy	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean Liquids



		Glass	0 to 9,999 μS 10 to 200 mS	±1%	10 kohm to 30 Mohm	±1%	-999 to 999	±1 mV	0 to 14	±0.01 pH	0 to 9,999 ppm 10 to 200 ppt	±1%	32 to 160	IP67, NEMA 6	CE Marked	2 1/2"	2 3/4"	7 3/4"	Yes	Canada	LCD	000000	000000000

Replacement Sensors

For Testing		Each
Oxidation Reduction Potential (ORP), pH	000000	0000000

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.

For Testing Conductivity and pH

Image of Product. Front orientation. Chemistry Meters. Bench-Top Multifunction Chemistry Meters .

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Conductivity		pH
	Sensor Material	Range	Accuracy	Range, pH	Accuracy	ATC Range, ° F	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To		Each
For Use With Clean Liquids



		Glass	0 to 10 μS 0 to 100 μS 0 to 1,000 μS 0 to 10,000 μS	±2%	2 to 12	±0.2 pH	50 to 160	4"	3 1/2"	4 1/2"	Yes	Canada	00000000	0000000

Replacement Sensors

For Testing		Each
pH, Conductivity	00000000	0000000

Remote-Reading Multifunction Chemistry Meters with PC Output

Test temperature, chemical concentration, contamination, and salt levels in liquid from up to 6 ft. away, then send the results to your computer for analysis. These meters include a USB cable that transfers up to 1,000 readings. Often used to test water quality, they work on both clean and dirty liquids—from tap water to wastewater. Conductivity tests measure the concentration of salts, nutrients, chemicals, and other substances. Total dissolved solids (TDS) tests report contaminant levels. Salinity tests determine the salt levels in liquid. The sensor is made of stainless steel, so it’s durable and resists breaking. IP67 rated, these meters are dust tight and withstand temporary submersion.

To prevent inaccurate results from changing temperatures, these meters automatically standardize temperature readings at 77° F. Temperature readings appear on screen with other measurements, so you won’t have to scroll through multiple screens. A data hold function freezes the current reading on the display.

To maintain accuracy of the meters, they come with calibration solutions and have a calibration button.

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

Cannot Be Sold to Canada—Meters cannot be sold to Canada due to import regulations.

	Conductivity		Resistivity		Salinity			Total Dissolved Solids (TDS)
	Range	Accuracy	Range, Mohm	Accuracy	Range, ppt	Accuracy	Temp. Accuracy	Range	Accuracy	ATC Range, ° F	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To	Display Type		Each
For Use With Clean and Dirty Liquids



		0 mS to 200 mS	±1.5%	0 to 20	±1.5%	0 to 100	±1.5%	±0.9° F	0 ppt to 100 ppt	±0.1%	32 to 212	IP67	CE Marked	6 5/16"	3 3/16"	1 5/8"	Yes	Canada	LCD	00000000	000000000

Replacement Sensors for Chemistry Meters

For Testing		Each
Conductivity, Resistivity, Salinity, Temperature, Total Dissolved Solids (TDS)	00000000	0000000

Buffer Solutions


500 ml Container	1 gal. Container

Maintain the accuracy of chemistry sensors.

	Calibration Point		Each
500 ml Container



	Conductivity, Total Dissolved Solids (TDS)	40.38 ppm; 84 μS	000000000	000000


	Conductivity, Total Dissolved Solids (TDS)	745 ppm; 1,413 μS	000000000	00000
	Conductivity, Total Dissolved Solids (TDS)	1,382 ppm; 2,764 μS	000000000	00000
	Conductivity, Total Dissolved Solids (TDS)	7,447 ppm; 12,880 μS	000000000	00000


	1 gal. Container



			Conductivity	1,413 μS	000000000	00000


			Conductivity	12,880 μS	000000000	000000

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.

For Testing Conductivity

Image of Product. Front orientation. Chemistry Meters. Bench-Top Conductivity Meters .

		Conductivity
	Sensor Material	Range	Accuracy	ATC Range, ° F	Ht.	Wd.	Dp.	Batteries Included		Each
For Use With Dirty Liquids



		Plastic	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


		Plastic	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

Conductivity Meter Cases

		Each
Carrying Case	0000000	0000000

Sanitary Conductivity Sensors

Three-Color Display

Image of Attribute. Front orientation. Contains Annotated. Chemistry Meters. Sanitary Conductivity Sensors.

Often used to save rinse water in beverage and pharmaceutical lines, these sensors test the amount of chemicals, cleaners, and other substances in liquids by measuring how well the liquid conducts electricity. They’re 3-A and European Hygienic Engineering and Design Group (EHEDG) certified, thanks to their design that’s easy to keep clean. Highly polished, they limit where bacteria could grow. They also withstand washdowns with hot water, chemicals, and cleaners common to sanitary lines because of their PEEK probe, stainless steel body, and IP ratings. Their IP ratings also mean they’re dust tight and won’t fail if briefly under water. All are FDA compliant to safely touch food.

These sensors work with 4-20 mA analog output to connect to remote displays and programmable logic controllers (PLCs), making them good for hard-to-reach areas and frequent application changes. This also means they’ll set off alarms and trigger cycles to start and stop in automated systems. With the touchscreen, program each color of the display to alert you to errors, completed cycles, and other events. Both the head and the display rotate to view readings from the best angle.

Highly accurate, these sensors test almost any liquid. They also measure temperature—no need for a separate sensor. To compare readings as temperature changes, they automatically standardize readings at 77° F. All meet European safety standards, since they’re CE marked.

Cannot Be Sold To—Import regulations restrict sales to the listed areas.

		Sensor			Conductivity
	Lg., mm	Material	Dia., mm	Lg., mm	Range	Accuracy	Electrical Connection Type	Pipe Size	Thread Type	Gender	ATC Range, ° F	Enclosure Rating	Certification	Food Industry Std.	Cannot Be Sold To		Each
For Use With Liquids



		37	PEEK	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 μS	±1.5% ±1% ±1.5%	Threaded M12 Plug (Two 4-Pole Connections)	1	BSPP	Male	-4 to 302	IP67, IP69K	CE Marked, EHEDG Certified	3-A Certified 74-07, FDA Compliant 21 CFR 177.2415	Canada	0000000	000000000


		60	PEEK	3.6	26	0 to 1,000 mS 0 to 500 mS 0 to 500 μS	±1.5% ±1% ±1.5%	Threaded M12 Plug (Two 4-Pole Connections)	1	BSPP	Male	-4 to 302	IP67, IP69K	CE Marked, EHEDG Certified	3-A Certified 74-07, FDA Compliant 21 CFR 177.2415	Canada	0000000	00000000

Fittings

		Each
Quick-Clamp Adapter	0000000	0000000

Buffer Solutions with Analysis Certificate

500 ml

Container

Ensure accurate calibration results with these solutions that come with an analysis certificate traceable to NIST that states they’ve passed a test for concentration.

	Calibration Point, μS		Each
500 ml Container



	Conductivity	84	0000000	000000


	Conductivity	1,413	0000000	00000
	Conductivity	12,880	0000000	00000