The HI98121 is a waterproof pH, ORP and temperature meter. The housing of this tester has been completely sealed against humidity and is designed to float. Electrode replacement with the stainless steel round connector means there are no pins to bend or break during replacement. When the cloth junction becomes clogged and response time is sluggish, simply pull out 3 mm (1/8”) to clear the clogging which will improve response time and stability.
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.
Waterproof
Automatic Temperature Compensation
HOLD feature
Simple to use
Economical
| SKU | HI98121 |
| Product Name | pH/ORP/Temperature Combo Tester – HI98121 |
| Quote Required | Yes |
| pH Range | -2.00 to 16.00 pH |
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.05 pH |
| 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.) |