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SKU HI98128 Categories ,

Waterproof pHep®5 pH Tester and Temperature meter - HI98128

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Hanna’s pHep®5 waterproof tester is an advanced pH meter that has many features found in more expensive portable and benchtop meters. This ergonomic meter measures from -2.00 to 16.00 pH with an accuracy of ±0.05 pH. pHep®5 features automatic one or two-point calibration to known buffer, automatic temperature compensation. The large multi level LCD display shows both pH and temperature readings simultaneously, while a stability indicator is displayed to alert the user when a stable reading has been obtained. The pHep®5 tester also features a replaceable pH probe that has a unique extendable cloth junction to clear any clogging that occurs.

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The pHep®4 is a waterproof pH tester with a 0.1 pH resolution and an accuracy of ±0.1 pH. It has many advanced features that are found in more expensive portable instrumentation. One or two-point calibration is automatic to two selectable buffer sets (4.01, 7.01 and 10.01 or 4.01, 6.86, and 9.18). The pHep®4 also features a replaceable electrode with a stainless steel round connector. This cartridge design has no pins to line up or that can break. The HI73127 replacement pH electrode also features an extractable cloth junction. The extractable cloth junction of the HI73127 allows for the renewing of the junction. Simply extract ⅛” of the junction by pulling on the junction will expose a new portion. Any clogging that was present will be cleared and the response time will be back to normal extending the life of the pH electrode.

Features at-a-glance

  • Waterproof
  • Designed to float if accidentally dropped in a tank
  • Expanded pH Range
  • pH range is from -2.0 to 16.0 pH
  • Automatic Temperature Compensation
  • All readings are compensated for variations in temperature
  • Temperature displayed in °C or °F along with pH reading
  • Stability indicator
  • Meter displays a clock tag that will disappear when the reading has achieved stability
  • HOLD button
  • Freezes reading on the display to allow recording of measurement
  • BEPS (Battery Error Prevention System)
  • Meter will automatically shut off if there is not enough power to get an accurate measurement
  • Auto-off
  • Meter automatically shuts off after 8 minutes of non-use to maximize battery life




-2.0 to 16.0 pH


0.1 pH


±0.1 pH


automatic, at one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)

Temperature Compensation




-5.0 to 60.0°C / 23.0 to 140.0°F


0.1°C / 0.1°F


±0.5°C /±1°F

Additional Specifications

pH Electrode

HI73127 replaceable pH electrode (included)

Temperature Probe

integrated thermistor


after 8 minutes of non-use

Battery Type/Life

1.5V (4) / approx. 300 hours of continuous use


-5 to 50°C (23 to 122°F); RH max 100%


163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’)


100 g (3.5 oz.)

Ordering information

HI98127 (pHep®4) is supplied with HI73127 pH electrode, HI73128 electrode removal tool, batteries and instructions.

Additional Informations

Additional information



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