Hanna HI98121 pH/ORP/Temperature Tester

Hanna HI98121 pH/ORP/Temperature Waterproof Tester

The Hanna HI98121 pH/ORP/Temperature Tester is a multi-functional, waterproof tester designed for simultaneous measurement of pH, ORP (oxidation-reduction potential), and temperature. With high accuracy and a replaceable electrode, this compact device is ideal for professionals in water treatment, aquaculture, pool maintenance, and environmental monitoring.

Key Features

• 3-in-1 Measurement Capability
  This tester combines pH, ORP, and temperature measurements into one portable unit. As a result, users can evaluate water quality conditions more efficiently and with fewer tools.

• High Precision and Resolution
  It offers ±0.05 pH accuracy and 0.01 pH resolution, along with ±2 mV accuracy for ORP. Therefore, it’s suitable for critical applications requiring reliable monitoring.

• Automatic Temperature Compensation (ATC)
  With ATC from -5.0 to 60.0°C, readings are consistently accurate—even when environmental conditions change.

• Simple Calibration Process
  The device supports automatic pH calibration at one or two points, using two standard buffer sets. Additionally, ORP calibration is factory set, so it’s ready to use right out of the box.

• Replaceable Combination Electrode
  The sensor module is user-replaceable, extending the tester’s service life and reducing long-term costs. Furthermore, the easy-to-remove cartridge design simplifies maintenance.

• Long Battery Life and Auto-Off Function
  Powered by four 1.5V batteries, the tester provides approximately 250 hours of continuous operation. The auto-off feature saves energy by shutting off the unit after 8 minutes of inactivity.

• Waterproof and Durable
  Its IP67-rated waterproof housing ensures performance even in wet or harsh environments. As such, it’s well-suited for both lab and fieldwork.

Technical Specifications

• pH Range: -2.00 to 16.00 pH

• pH Resolution: 0.01 pH

• pH Accuracy: ±0.05 pH

• ORP Range: ±1000 mV

• ORP Resolution: 1 mV

• ORP Accuracy: ±2 mV

• Temperature Range: -5.0 to 60.0°C

• Temperature Resolution: 0.1°C

• Temperature Accuracy: ±0.5°C

• pH Calibration: Automatic (1 or 2 points with two buffer sets)

• ORP Calibration: Factory calibrated

• Battery: 4 x 1.5V batteries

• Battery Life: Approx. 250 hours

• Auto-Off: After 8 minutes of non-use

• Environment: -5 to 50°C; RH max 100%

• Dimensions: 163 x 40 x 26 mm

• Weight: 100 g

Applications

• Water Treatment and Disinfection
  Monitor both pH and ORP in chlorination and ozonation systems to ensure safe, effective water treatment.

• Aquaculture and Fish Farming
  Maintain optimal water chemistry to promote aquatic health and prevent stress or disease.

• Swimming Pools and Spas
  Regularly verify sanitation levels and balance water chemistry for safety and comfort.

• Laboratory and Research
  Ideal for multi-parameter testing in educational and environmental labs.

• Food Processing and Beverage Plants
  Ensure hygienic and regulated water quality in cleaning, processing, and wastewater management.