Hanna HI 9125 Waterproof Portable pH/mV Meter

Hanna HI 9125 Waterproof Portable pH/mV Meter

The HI9125 is a robust, waterproof, high-spec portable pH and mV meter that offers the added benefit of being able to measure ORP. This meter offers many features such as automatic calibration, automatic shutdown, battery error prevention system, on-screen instructions and automatic temperature compensation. The HI9125 is supplied with the meter, PEI plastic housing, dual-junction pH electrode and temperature probe packed in a durable plastic carrying case.

Supplied with

  • HI-1230B pH electrode
  • HI-7662 temperature probe
  • Starter pack of buffer solutions
  • 100 ml plastic beaker
  • Batteries and instructions
Water Resistant

Water Resistant – Can withstand temporary exposure to water, but should not be submerged or washed under running water.

Replaceable Electrode

Replaceable Electrode – No need to replace the whole meter when the electrode needs replacing. Spare and replacement electrodes are available for this product.

Key features

  • Heavy-duty waterproof casing
  • Large clear LCD display
  • Extended pH and temperature given simultaneously
  • Memorises pH reading and recall
  • Battery % remaining on start up
  • User-friendly text and graphics support calibration procedure without constant reference to a manual
  • Automatic temperature compensation
  • Rubberised keyboard
  • Fully automatic buffer recognition
  • Automatic pH calibration with five memorised pH buffer values and buffer recognition to simplify calibration
  • User-selectable calibration time-out
  • Battery error prevention system (BEPS)
  • HI-7662 stainless steel temperature sensor included as standard
  • HI-1230B double junction pH electrode minimises junction contamination and enhances accuracy (supplied as standard)

The HI 9125 is a waterproof pH meter using ORP (oxidation reduction potential) electrodes. Large dual level LCD displays both pH and temperature along with operational guide. Graphic symbols are displayed to assist users during the calibration process.

The pH calibration procedure is automatically stored in five memory pH buffer values and Buffer recognition to facilitate the calibration process. This meter uses the Hawaiian 1230B double junction pH electrode. Double junction helps to minimize junction contamination for accurate, consistent results.


Range - pH -2.00 to 16.00 pH
Range - mV ±699.9 mV; ±1999 mV
Range - Temperature 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 - Temperature 0.1 ° C / 0.1 ° F
Accuracy - pH ± 0.01 pH
Accuracy - mV ± 0,2 mV; ± 1 mV
Accuracy - Temperature ± 0,4 ° C / ± 0,8 ° F
pH Calibration automatic 1 or 2 point with 5 memorised buffer values (4.01, 6.86, 7.01, 9.18, 10.01)
Offset Calibration ± 1 pH
Slope Calibration From 80 to 108%
Temperature Compensation automatic or manual, -20 to 120°C (-4 to 248°F)
pH Electrode HI 1230B, double junction, gel filled, BNC connector and 1 m (3.3’) cable (included)
Temperature Probe HI 7662 with 1 m (3.3’) cable (included)
Input Impedance 10¹² Ohm
Battery Type / Life (4) 1.2V AAA rechargeable / approx 200 hours of continuous use (with backlight off); auto-off after 20 minutes of non-use (can be disabled)
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 192 x 71.6 x 36 mm (7.5 x 2.8 x 1.4 inch)
Weight 525 g (18.5 oz.)