Portable pH Meters

Portable pH Meters
Instruments used to measure the acidity or alkalinity of a sample, and designed for portability and durability.
Portable pH meters are most often used away from the physical lab to measure the acidity or alkalinity of liquids in more remote locations.
A pH meter actually measures hydrogen-ion activity in water-based solutions. The liquid’s acidity or alkalinity is expressed as a pH unit. The pH scale ranges from 0 to 14, meaning a liquid with a pH below 7 is acidic and a pH above 7 is basic. A pH of 7 is considered neutral.
Also called electrochemistry meters, pH meters are potentiometric and determine the difference in electrical potential between the measuring electrode and a reference electrode.
Some portable pH meters accomplish routine tasks, often used to determine the pH of swimming pools and meet other commercial needs. These are sometimes called pH testers. Indicators or litmus papers can also be used to qualitatively measure pH.
Modern portable pH meters are typically digital and may detect more than pH. Some are equipped to measure specific ions, dissolved oxygen content, or conductivity.
Many portable pH meters are waterproof to protect against accidental dropping or adverse environmental conditions like rain or snow. Some electrodes are also equipped with longer cables to allow for submersion in a reservoir of water or other liquid.
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Filtered Search Results

OHAUS™ Starter pH Pen Meters
Convenient pH testing. OHAUS Starter pH Pen Meters offer a convenient way to measure pH, or the relative acidity or alkalinity of a sample at a given temperature. The pH pen meters can be completely operated with just one hand, freeing up your other hand to handle samples.

Calibration Points | 3 |
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Includes | 4 1.5V Batteries |
Type | Portable pH Meter |
Log Function Type | Automatic Data Logging |
Data Points | 30 |
Backlight Option | None |
Weight (English) | 0.24 lb. |
Range (pH) | 0 to 14 |
Calibration | Automatic/Manual |
For Use With (Application) | Measuring pH, or the relative acidity or alkalinity of a sample at a given temperature |
Battery Type | 4 x AG13 1.5 V Micro Alkaline |
Accuracy (pH) | ±0.1 |
Weight (Metric) | 110 g |
Thermo Scientific™ Orion Star™ A121 Portable pH Meter
Take simple pH and temperature measurements with our portable pH meter with easy operation for basic field testing.

Memory | Non-volatile memory preserves log and settings |
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Resolution (pH) | 0.01, 0.1 |
Languages | English |
Measurement Modes | pH,mV,Relative mV with Temperature |
Range (pH) | -2 to 16 |
Channels | 1 |
Accuracy (pH) | ±0.01 |
Power Supply | 4 AA batteries (included) or universal AC adapter (sold separately) |
Battery Life | 2000 hr. |
Data Management Details | Internal Data Point Memory |
Display Type | LCD |
Resolution (mV) | 0.1mV |
Data Points | 50 |
Certifications/Compliance | CE, TUV 3-1, FCC Class A |
Temperature Probe Calibration | 1 point temperature offset calibration |
Inputs | BNC (pH or ORP electrode), 8 pin MiniDIN (ATC temperature probe) |
Accuracy (Temperature) | ±0.1°C |
Weight (Metric) | 0.5 kg |
Accuracy (mV) | ±0.2 or ±0.05%, whichever is greater |
Stability | Smart Stability and Smart Averaging |
Warranty | 3 Year Meter Warranty |
Temperature (English) Operating | 41°F to 113°F (ambient) |
Isopotential Point | 7.00pH |
AC Adapter | Universal 50-60 Hz, 100-240 VAC power adapter (sold separately, Cat. No. 1010003) |
Log Function Type | Automatic with Auto-Read Measure Mode, Manual with Continuous Measure Mode |
Calibration | pH, relative mV (RmV) and temperature |
Battery Type | 4 x AA |
Relative Humidity Range | 5 to 85%, non-condensing |
Calibration Points | 1 to 3 |
Dimensions (L x W x H) | 24 cm x 10 cm x 6.5 cm (9.5 in. x 3.9 in. x 2.6 in.) |
IP Rating | IP67 |
Temperature Selection | Manual or automatic with ATC temperature probe |
Keypad | Simple with highlighted measure key, scroll and shortcut keys |
Model | Orion Star A121 Portable pH/mV/RmV/Temperature Meter |
Outputs | None |
Range (Relative mV) | ±1999.9mV |
Temperature Range (English) | 22.0°F to 221.0°F |
Weight (English) | 2 lb. |
Resolution (Temperature) | 0.1°C, 0.1°F |
Temperature (Metric) Operating | 5°C to 45°C (ambient) |
Temperature Range (Metric) | -5°C to +105°C |
Range (mV) | ±1600.0 |
Mettler Toledo™ FiveGo™ F2 pH/mV Meters
Portable meter provides reliable and high quality pH/mV measurements with simple click of a button
Accuracy (mV) | ±1 |
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Memory | 200 measurements, current calibration |
Log Function Type | Automatic, Manual |
Resolution (pH) | 0.01 |
Measurement Modes | pH |
Range (pH) | 0 to 14 |
Calibration | Linear |
Calibration Points | 3 |
Temperature Compensation | ATC and MTC |
Dimensions (L x W x H) | 18.8 x 7.7 x 3.3 cm (97.4 x 3 x 1.3 in.) |
Display Type | LCD |
Model | F2 |
Resolution (mV) | 1mV |
Data Points | 200 |
Backlight Option | None |
Weight (English) | 0.5 lb. |
Resolution (Temperature) | 0.1° |
Temperature Range (Metric) | 0°C to 100°C |
Range (mV) | -1999 to 1999 |
Inputs | BNC, Cinch |
Accuracy (Temperature) | ±0.5°C |
Weight (Metric) | 0.26 kg |
Oakton™ Waterproof Big Display pHTestr™ 30
Versatile, compact design works in a field or laboratory setting.

Diameter (English) | 1.5 in. |
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Warranty | 1 Year |
Length (Metric) | 16.5 cm |
Temperature (English) Operating | 32.0°F to 122.0°F |
Detection Range | -1 to 15 pH |
Resolution (pH) | 0.01 |
Measurement Modes | pH |
Range (pH) | -1 to 15 |
Calibration | Automatic |
For Use With (Application) | Hold function, auto-off, error messages, waterproof, dustproof and floatable |
Accuracy (pH) | ±0.01 |
Calibration Points | 1 to 3 |
Accuracy | ±0.1 pH |
Display Type | LCD |
IP Rating | IP66/67 |
Diameter (Metric) | 3.8 cm |
Backlight Option | None |
Certifications/Compliance | NIST |
Resolution (Temperature) | 0.1°C |
Temperature (Metric) Operating | 0°C to 50°C |
Accuracy (Temperature) | ±1°C |
Resolution | 0.1pH |
OHAUS™ Starter Water Analysis Portable pH Meters
LCD meters combine portability with precise pH measurement.
Width (English) | 3.5 in. |
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Resolution (pH) | 0.01 |
Measurement Modes | pH with mV and Temperature |
Range (pH) | 0 to 14 |
Width (Metric) | 9 cm |
Accuracy (pH) | ±0.01 |
Battery Life | >500 hr. |
Data Management Details | 30 Sets, most recent calibration data |
Display Type | LCD |
Resolution (mV) | 1 mV |
Data Points | 30 |
Inputs | BNC, NTC |
Accuracy (Temperature) | ±0.5°C |
Height (English) | 1.3 in. |
Weight (Metric) | 0.18 kg |
Height (Metric) | 3.5 cm |
Accuracy (mV) | ±1 |
Log Function Type | Automatic Data Logging |
Material | ABS |
Calibration | Automatic/Manual |
Battery Type | AAA |
Calibration Points | 1 to 3 |
Type | Portable pH Meters |
IP Rating | IP54 |
Depth (Metric) | 17 cm |
Backlight Option | None |
Resolution (Temperature) | 0.1°C |
Temperature Range (Metric) | 0°C to 100°C |
Range (mV) | -1999 to 1999 |
Resolution | 0.01 pH; 1 mV; 0.1°C |
Oakton™ pHTestr™ Waterproof Pocket pH Testers
Oakton™ pHTestr™ Waterproof Pocket pH Testers have large easy-to-read LCD display featuring three-color backlight
Height (Metric) | 4 cm |
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Accuracy (mV) | ±0.2% full-scale |
Warranty | 2 Years |
Resolution (pH) | 0.01 |
Measurement Modes | pH |
Range (pH) | -2 to 16 |
Calibration | USA, NIST |
For Use With (Application) | Water Quality Testing |
Width (Metric) | 4 cm |
Battery Type | 4 AAA |
Channels | 1 |
Accuracy (pH) | ±0.01 |
Calibration Points | 1, 2 or 3 |
Includes | pH Tester, protective plastic storage case, lanyard, and four AAA batteries. |
Type | pH Tester |
Battery Life | 400 hr. |
Temperature Compensation | Automatic |
Display Type | LCD |
IP Rating | IP67 |
Backlight Option | Yes |
Temperature Range (English) | 32°F to 122°F |
Certifications/Compliance | CE |
Resolution (Temperature) | 0.1°F/°C |
Temperature Range (Metric) | 0°C to 50°C |
Accuracy (Temperature) | ±0.5°C;/±0.9°F |
Thermo Scientific™ Elite pH Pocket Testers and Replacement Sensors
Flexible on-the-go pH and temperature testing using durable Elite pocket testers with replaceable sensors for a variety of applications including environmental monitoring, pools, spas and more!
Thermo Scientific™ Orion Star™ A221 Portable pH Meter
Reliably measure pH, mV, ORP and temperature with our portable pH meter for advanced field analysis and printer or computer interfacing.
Oakton™ pHTestr 50 Waterproof Pocket pH Tester
Oakton pHTestr 50 has a replaceable double junction sensor for longer life, an expanded number of applications, and easy maintenance. Versatile, compact design works in the field or laboratory
Oakton™ ORPTestr™ 5 Waterproof Pocket Tester
Oakton™ ORPTestr™ 5 Waterproof Pocket Tester features a large easy-to-read LCD with a three-color backlight
Oakton™ CTSTestr™ 5 Waterproof Pocket Tester
Oakton™ CTSTestr™ 5 Waterproof Pocket Tester offers onductivity, salinity, and TDS testing all in one meter