This document describes the features and characteristics of Hanna Instruments' portable waterproof skin pH meter, including measurement range, resolution, accuracy, temperature compensation, etc.
The HI 99181 is a microprocessor-based portable pH and temperature meter designed specifically for measuring skin pH. It features a special flat surface probe (HI 1414D/50) with a built-in temperature sensor to provide automatic temperature compensation. The device includes an integral pH sensor preamplifier to ensure measurements are impervious to noise and electrical interferences.
| Range | -2.00 to 16.00 pH, -5.0 to 105.0°C / 23.0 to 221.0°F |
|---|---|
| Resolution | 0.01 pH / 0.1°C / 0.1°F |
| Accuracy (pH) | 0.02 pH at 20°C/68°F |
| Battery Life | Approximately 1200 hours of continuous use |
It is recommended to calibrate before each set of skin measurements and whenever the electrode is replaced or stored for long periods.
Wet the skin portion to be tested with distilled water or HI 70960 electrolyte solution.
Soak the probe in HI 70300 storage solution for 30 minutes.
The meter must be recalibrated before each set of skin measurements.