Extech Model PH90 is a waterproof pH / temperature meter equipped with a flat surface pH electrode (model pH95) for reliable test results.
This document is the user manual for the Extech Model PH90 waterproof pH/Temperature meter. The instrument is equipped with a replaceable flat surface pH electrode (model pH95) and features an LCD display that shows pH and temperature measurements simultaneously. Key features include automatic buffer recognition, automatic temperature compensation (ATC), and an IP57 waterproof rating allowing the meter to float in water.
The manual provides instructions on getting started, including battery installation and electrode replacement. It details the operation of the device, covering calibration procedures using pH 4, 7, and 10 buffers, and explains how to perform pH measurements and temperature readings. It also describes functions such as data hold, maximum/minimum recording, and unit selection.
| pH Range | 0 to 14.00 pH |
|---|---|
| Temperature Range | 0 to 90.0°C (32 to 194°F) |
| pH Accuracy | ± (0.01pH + 1dgt) |
| Temperature Accuracy | ± 0.5°C + 1 dgt |
| Power | 2 x 3V Lithium batteries (CR2032) |
| Dimensions | 36 x 170 x 36mm |
| Weight | 85g |
The meter uses two 3V Lithium batteries (CR2032).
The meter displays a slope percentage (PTS); if it is less than 70% or greater than 130%, the electrode must be replaced.
Yes, it has a waterproof design (IP57) and the meter can float in water.
The display range is from 0 to 14.00 pH.