This is a pH, TDS, Temperature Monitor produced by Hanna Instruments, model number HI 981504.
The Hanna Instruments HI 981504 is a device designed for continuously monitoring pH, Total Dissolved Solids (TDS), and temperature simultaneously. It features three backlit LCD displays and includes an HI 1286 gel-filled pH electrode and an HI 7634 TDS probe with a fixed temperature sensor. The instrument allows users to select between Celsius or Fahrenheit for temperature readings via a rear panel switch.
| pH Range | 0.0 to 14.0 pH |
|---|---|
| Temperature Range | -10.0 to 60.0°C / -14.0 to 140.0°F |
| pH Resolution | 0.1 pH |
| TDS Resolution | 10 ppm |
| Temperature Resolution | 0.1°C/0.1°F |
| pH Accuracy | +/- 0.2 pH |
| TDS Accuracy | +Mts. |
| Temperature Accuracy | +/- 0.3°C/ +/- 0.5°F |
| Dimensions | 160 x 110 x 35 mm (6.3x4.3x1.4") |
| Weight | 560 g (1.2 lb.) |
The user can easily select the temperature unit (°C or °F) through a switch on the rear panel.
Two models are available: HI 981504/5 with a 0.5 TDS factor and HI 981504/7 with a 0.7 TDS factor.
Store the electrode with a few drops of HI 70300 storage solution in the protective cap; do not use distilled or deionized water.
It is recommended to clean the pH electrode at least once a week by immersing it in HI 700661 cleaning solution for half an hour.