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pH/ORP/Temperature Combo Tester - HI98121


The HI98121 pH/ORP/Temperature tester is a reliable, waterproof tester that ensures quick and easy measurements of both pH and ORP. This accurate pH and ORP tester features 0.01 pH resolution with automatic two-point calibration and temperature compensation in a single, portable, pocket device.

  • ±0.05 pH / ±2 mV pH Accuracy
  • Replaceable pH Electrode 
  • Automatic Two-Point pH Calibration

This combination tester has many useful features. The compact, waterproof casing is designed to float when dropped in water. The tester is factory calibrated and measures temperature in both °C and °F. A stability tag that indicates when the reading has stabilized. Battery level and low-battery indicator are clearly displayed on the LCD to alert the user in the event that low battery power could adversely affect the readings.

The HI73127 spare pH sensor is designed is an easy-fit cartridge that locks into place, featuring two o-rings to maintain a watertight seal.

Oxidation Reduction Potential (ORP) measurements are a valuable parameter when evaluating water quality. ORP allows users to monitor the effectiveness of disinfecting compounds and to monitor redox reactions. HI98121 is commonly used to monitor pH and chlorine for many applications including swimming pools, spas, food sanitization, plating baths, wastewater treatment, and cooling tower water treatment.

An ORP sensor must be chemically inert; it cannot be oxidized or reduced itself. It must also have the proper surface characteristics to promote rapid electron exchange, a property known as high exchange current density. Two noble metals have proven to work well for this purpose: pure platinum and pure gold are both used in the construction of ORP sensors.

Features at-a-glance:

Waterproof casing designed to float if dropped in water

Automatic Temperature Compensation, displays temperature in °C or °F

HOLD button for easier measurement recording

Two-button Operation

Large LCD displays stability indicator, low battery indicator and calibration tags

Slim, Ergonomic Design that fits comfortably in the hand or pocket

More Information
pH Range -2.00 to 16.00 pH
pH Resolution 0.01 pH
pH Accuracy ±0.05 pH
pH Calibration 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)
pH Temperature Compensation automatic for pH readings
ORP Range ±1000 mV
ORP Resolution 1 mV
ORP Accuracy ±2 mV
Temperature Range -5.0 to 60.0°C / 23.0 to 140.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy ±0.5°C /±1°F
pH Electrode HI73127 replaceable pH electrode (included)
ORP Electrode fixed ORP sensor
Automatic Shut-Off after 8 minutes non-use
Battery Type/Life 1.5V (4) / approximately 250 hours of continuous use
Environment -5 to 50°C (23 to 122°F); RH max 100%
Dimensions 163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’)
Weight 100 g (3.5 oz.)
Ordering Information HI98121 (ORP/pH) is supplied with HI73127 pH electrode, HI73128 electrode removal tool, batteries and instructions.
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