Hanna Instruments HI98121 pH/ORP/Temperature Combo Tester

A trustworthy, waterproof tester that offers quick and simple measurements of both pH and ORP with 0.01 pH resolution and temperature adjustment is the HI98121 pH/ORP/Temperature tester. Numerous applications, such as swimming pools, spas, food sanitization, plating baths, wastewater treatment, and cooling tower water treatment, employ this tester to monitor pH and chlorine.


  • 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
  • Automatic calibration to one or two points
  • Slim, Ergonomic Design that fits comfortably in the hand or pocket