PH Chemistry Meters | McMaster-Carr

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Maximum Total Dissolved Solids (TDS)

9,999 ppm

200 ppt

Minimum Automatic Temperature Compensation (ATC)

45 Products

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 Oxidation Reduction Potential (ORP), pH, and Temperature

Image of Product. Front orientation. Chemistry Meters. Remote-Reading Multifunction Chemistry Meters , For Testing Oxidation Reduction Potential (ORP).

Oxidation reduction potential (ORP), pH, and temperature meters take three measurements. ORP measures the amount of dissolved oxygen in liquids. It determines how efficiently a liquid breaks down contaminants.

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

	Oxidation Reduction Potential (ORP)		pH
	Range, mV	Accuracy	Range, pH	Accuracy	Temp. 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



		-1,000 to 1,000	±0.2%	0 to 14	±0.01 pH	±0.9° F	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
Oxidation Reduction Potential (ORP)	0000000	0000000
pH	0000000	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, Oxidation Reduction Potential (ORP), pH, 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		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

Remote-Reading pH Meters with PC Output

Transmit pH readings to a PC for analysis. These meters have a sensor on a 6-ft. cable for taking remote readings of water and other clean liquids. They have automatic temperature compensation that standardizes readings at 77° F to prevent inaccurate readings in fluctuating temperatures. Use the included calibration solution and calibration button to maintain accuracy.

For Testing pH and Temperature


LCD Display

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

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



		Plastic	-2 to 16	±0.01 pH	-22 to 260	CE Marked	6 5/16"	3 3/16"	1 5/8"	Yes	Canada	LCD	00000000	0000000

Replacement Sensors

	Each
000000000	0000000

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 Chlorine, Oxidation Reduction Potential (ORP), and pH

Chlorine, oxidation reduction potential (ORP), and pH meters come with three sensors that each take one chemistry measurement.

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

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



		Glass	-999 to 999	±1 mV	0 to 14	±0.01 pH	23 to 194	IP57	CE Marked	6 7/8"	Yes	Canada	LCD	0000000	0000000

Replacement Sensors

For Testing		Each
Oxidation Reduction Potential (ORP)	0000000	000000
pH	0000000	00000
Chlorine	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.

For Testing pH

Image of Product. Front orientation. Chemistry Meters. pH Meters .

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

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



		Glass	0 to 14	±0.1 pH	32 to 122	7"	1 1/2"	1 1/4"	Yes	Canada	LCD	0000000	000000

Water-Quality Test Strips

Dip these strips into your liquid to quickly test water conditions. Strips change color to indicate the value reached; match the color of the strip to the color chart on the bottle to interpret the results.

For Testing	Range	No. of Strips	Each
pH	0 pH to 14 pH	100	000000
pH	0 pH to 6 pH	100	00000
pH	6.5 pH to 13 pH	100	00000
pH	4 pH to 10 pH	50	00000
Free Chlorine, Total Chlorine Total Alkalinity Total Hardness pH	0 ppm to 10 ppm 0 ppm to 425 ppm 0 ppm to 240 ppm 6.2 pH to 8.4 pH	30	00000

Multifunction Chemistry Controllers


LCD Display	Washdown Environments LCD Display

LED Display	Sensor

The same controller can actuate equipment based on pH or oxidation reduction potential (ORP). Using two SPDT (single pole, double throw) relays, these controllers can turn pumps, valves, and other equipment on or off when a reading reaches the actuation point. They also send output signals to a PLC or other receiving device to record data and control equipment. Automatic temperature compensation standardizes readings at 77° F to prevent inaccurate results in fluctuating temperatures. These controllers are often used for water treatment, electroplating, and chemical processing.

They require a pH or ORP sensor (sold separately).

LED Display—Controllers with an LED display are more visible in low-light conditions than those with an LCD display.

Washdown Environments—Controllers for washdown environments are rated IP65 for protection against low-pressure washdowns and dust.

	Controllers																	pH Sensors		ORP Sensors
					pH		Oxidation Reduction Potential (ORP)
	No. of Control Relays	Switch Designation	Mechanical Relay Switching Current @ Voltage	Analog Output Current	Range, pH	Accuracy	Range, mV	Accuracy	Input Voltage, V AC	Mount Type	For DIN Panel Cutout Size	Ht.	Wd.	Dp.	Enclosure Rating		Each		Each		Each
LCD Display



		2	SPDT	5 amp @ 120V AC 2.5 amp @ 240V AC	4 mA to 20 mA	0 to 14	±0.05 pH	-1,999 to 1,999	±0.5%	120 240	Panel	1/4	3 3/4"	3 3/4"	4 3/4"	—	00000000	0000000	000000000	0000000	000000000	0000000


		LCD Display—For Washdown Environment



				2	SPDT	5 amp @ 120V AC 2.5 amp @ 240V AC	4 mA to 20 mA	-2 to 16	±0.17 pH	-2,500 to 2,500	±0.1%	120 240	Panel	1/4	3 3/4"	3 3/4"	6 5/8"	IP65	000000000	000000	000000000	000000	000000000	000000


				LED Display



						2	SPDT	5 amp @ 120V AC 2.5 amp @ 240V AC	4 mA to 20 mA	0 to 14	±0.05 pH	-1,999 to 1,999	±0.5%	120 240	Panel	1/4	3 3/4"	3 3/4"	4 3/4"	—	00000000	000000	000000000	000000	000000000	000000

pH Testing Paper

Check pH levels without a meter. When this testing paper is dipped in a sample, it changes color to indicate pH. Match the color of the testing paper to the color chart to determine the sample’s pH.

pH Range, pH	pH Numeric Increments, pH	No. of Color Points	Wd.	Lg., ft.		Each
0 to 13	1	14	1/2"	50	0000000	000000
1 to 6	1	6	1/4"	15	0000000	0000
1 to 11	1	11	1/2"	50	0000000	00000
3 to 5.5	0.5	6	1/2"	50	0000000	00000
3 to 9	1	7	1/2"	50	0000000	00000
6 to 8	0.4	7	1/2"	50	0000000	00000
6.5 to 13	0.5	14	1/4"	15	000000	0000
8 to 9.5	0.5	4	1/4"	15	0000000	0000
10 to 12	0.5	5	1/4"	15	0000000	0000

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.

For Testing pH

For Use With Clean Liquids—Meter for clean liquids is commonly used in pools and hydroponic solutions.

For Use With Dirty Liquids—Meter for dirty liquids stands up to wastewater, plating bath solutions, and other harsh liquids.

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

		pH
	Sensor Material	Range, pH	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 14	±0.1 pH	32 to 122	IP67	CE Marked	6 1/2"	1 1/2"	3/4"	Yes	Canada	LCD	00000000	0000000


		For Use With Dirty Liquids



				Glass	-2 to 16	±0.01 pH	32 to 122	IP67	CE Marked	7"	—	—	Yes	Canada	LCD	00000000	000000

Replacement Sensors

	Each
00000000	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.

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 pH Meters

Monitor pH readings from your smartphone or tablet—download the app to view data up to 160 ft. away using Bluetooth. Made of durable nonglass, the sensor resists breaking. They are for use with dirty liquids, so they stand up to petrochemical, environmental, and agricultural testing. Rated IP67, they seal out dust and withstand temporary submersion. Use a calibration solution (not included) and the calibration setting in the app to maintain accuracy.

For Testing pH

Image of Product. Front orientation. Chemistry Meters. Remote-Reading pH Meters .

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

	Chemistry Meters														Buffer Solutions
		pH
	Sensor Material	Range, pH	Accuracy	ATC Range, ° F	Data Connection	Enclosure Rating	Certification	Ht.	Wd.	Dp.	Batteries Included	Cannot Be Sold To		Each		Each
For Use With Dirty Liquids



		Plastic	0 to 14	±0.02 pH	32 to 176	Bluetooth	IP67	CE Marked	8 7/8"	1"	7/8"	Yes	Canada	0000000	000000000	000000000	000000

Replacement Sensors

	Each
0000000	0000000

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

	Test Kits						Refill Chemicals
	For Testing	Range	Test Type	No. of Tests		Each		Each
340 Tests



		Total Hardness Iron Total Dissolved Solids (TDS) Total Chlorine pH	0-30 gpg 1-5 ppm 0- 9,990 ppm 0.1-2.0 ppm 5-10 pH	Analog Analog Digital Analog Analog	120 50 50 120	0000000	0000000	0000000	000000

Water Test Kits

Analog

All the chemicals and labware you need for on-site sampling and water-quality testing.

Test Kits						Refill Chemicals
For Testing	Range	Test Type	No. of Tests		Each		Each



	pH	3-10.5 pH	Analog	100	000000	000000	0000000	000000