Extech CG304 Coating Thickness Gauge 0-2000 µm with Bluetooth and USB

Measure coatings up to 2000 µm with ±(3% + 1 µm) accuracy using the Extech CG304, a dual-mode gauge for ferrous and non-ferrous substrates.

Overview

The Extech CG304 is a handheld coating thickness gauge designed for non-destructive measurement of dry film thickness on metal substrates. It automatically recognizes ferrous (Fe) and non-ferrous (NFe) bases, switching between magnetic induction and eddy current principles. The integrated probe requires no external cables, and the backlit LCD shows readings in microns or mils.

What stands out

• Wide measuring range from 0 to 2000 µm (0 to 78.7 mils).
• High resolution: 0.1 µm up to 99.9 µm, then 1 µm for the rest of the range.
• Bluetooth and USB connectivity for data transfer and analysis.
• Stores up to 2000 readings in internal memory.
• Includes calibration foils, zero plates, software, USB cable, batteries, and pouch.

Technical details

• Measurement accuracy: ±(3% + 1 µm) on 0 to 1999 µm; ±(3% + 0.039 mils) on 0 to 78.7 mils.
• Minimum measurement area: 6 mm diameter.
• Minimum sample thickness: 0.3 mm.
• Power source: 2 x AAA batteries.
• Operating temperature: 0 to 50°C (32 to 122°F).
• Calibration methods: zero, 2-point, and basic.
• Auto power off: Yes.
• Display type: Backlit LCD.

Our verdict

The Extech CG304 combines precision, dual-substrate capability, and modern connectivity, making it a solid choice for professional coating inspection tasks.