Extech PH90 pH and Temperature Meter

The Extech PH90 combines a flat-surface pH electrode with automatic temperature compensation in an IP67-rated housing, delivering ±0.02 pH accuracy across the full 0.00 to 14.00 range.

Overview

This compact meter measures pH and temperature simultaneously, with a replaceable flat electrode that simplifies testing of liquids, semi-solids, and surfaces. Automatic 3-point calibration (pH 4, 7, 10) and a backlit LCD ensure reliable readings in varied conditions.

What stands out

• Flat surface electrode works on liquids, gels, and moist surfaces
• IP67 waterproof design for field use
• Automatic temperature compensation (0 to 60°C)
• Data hold and auto power off after 10 minutes
• Runs on 4 LR44 batteries for up to 80 hours

Technical details

• pH range: 0.00 to 14.00 pH; resolution 0.01 pH; accuracy ±0.02 pH
• Temperature range: 0 to 60°C (32 to 140°F); resolution 0.1°; accuracy ±0.5°C
• Calibration: automatic 3-point (pH 4, 7, 10)
• Electrode: replaceable flat surface pH electrode
• Display: LCD with backlight
• Power: 4 x LR44 batteries; approx. 80 hours continuous use
• Operating conditions: 0 to 50°C, <80% RH

Our verdict

A rugged, accurate pH meter that handles both liquids and surfaces—ideal for field technicians and lab use.