This document is the instruction manual of Hanna Instruments' HI 98120 Waterproof ORP & Temperature Meter.
The HI 98120 is a factory-calibrated, waterproof microprocessor-based meter designed to measure Oxidation-Reduction Potential (ORP) and temperature. It features a sealed housing that floats, an LCD with a stability indicator, and a Battery Error Prevention System (BEPS) to ensure accurate readings. The device includes a replaceable HI 73120 ORP electrode and a stainless steel temperature sensor.
| Range | +/- 1000 mV |
|---|---|
| Temperature Range | -5.0 to 60.0°C/23.0 to 140.0°F |
| ORP Resolution | 1 mV |
| ORP Accuracy | 2 mV (@20°C/68°F) |
| Temperature Accuracy | +0.5°C / +1°F |
| Battery Type | 4x 1.5V |
| Battery Life | Approx. 300 hours |
| Auto-off Time | After 8 minutes |
| Dimensions | 163 x 40 x 26 mm |
| Weight | 100 g |
Remove the four screws on the top of the meter, replace the four batteries paying attention to polarity, and replace the top ensuring the gasket is properly seated.
The meter displays a low battery symbol, and if the voltage is low enough to cause erroneous readings, the Battery Error Prevention System (BEPS) automatically turns the meter off.