HI 9125 pH meter View larger

HI 9125 pH meter


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HI 9125 is a rugged, portable pH meter in waterproof casing. HI 9125 can also be used to measure ORP on the mV scale with an optional ORP electrode.

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Waterproof Field pH Meter

Measures pH, mV & Temp (mV scale can be used with an optional ORP electrode to obtain Oxidation or Reduction Potential of a solution)

Simple to Operate

Ideal for Field Measurements

The Auto-Instruction feature guides the user step-by-step through the calibration process with graphic symbols. The automatic calibration procedure is simple and quick and can be performed at 1 or 2 points selected from 5 memorized buffers: pH 4.01, 6.86, 7.01, 9.18, 10.01. A stability indicator assures a correct calibration.

HI 9125 is supplied complete with HI 1230B pH electrode, HI 7662 temperature probe, pH 4 and pH 7 buffer sachets, 100 mL plastic beaker, batteries, rugged carrying case and instructions. 

Note:The pH standard solutions included with this meter are small packets to get you started. Additional calibration solutions are available separately.


Range pH: -2.00 to 16.00 pH

Range mV: ±699.9 mV; ±1999 mV

Range Temp: -20.0 to 120.0°C / -4.0°F to 248.0°F

Resolution pH: 0.01 pH

Resolution mV: 0.1 mV; 1 mV

Resolution Temp: 0.1°C / 0.1°F

Accuracy (@20°C/68°F) pH: ±0.01 pH

Accuracy (@20°C/68°F) mV: ±0.2 mV; ±1 mV

Accuracy (@20°C/68°F) Temp: ±0.4°C / ±0.8°F

pH Calibration: automatic, 1 or 2 point with 5 memorized buffer values (pH 4.01, 6.86, 7.01, 9.18, 10.01); offset calibration: ±1 pH; slope calibration: 70 to 108%

Temp. Compensation: automatic or manual, -20 to 120°C (-4°F to 248°F)

pH Electrode: HI 1230B, double junction, PEI® body, gel filled, BNC connector and 1 m cable (included)

Temp. Probe: HI 7662 with 1 m (3.3’) cable (included)

Battery Type / Life: 4 x 1.5V AA / approx. 200 hours of continuous use; auto-off after 20 minutes of non-use (can be disabled)

Environment: 0 to 50°C (32 to 122°F); RH max 100%

Dimensions: 185 x 72 x 36 mm (7.3 x 2.8 x 1.4’’)

Weight: 300 g (10.6 oz)