Measurement of the thickness of metal, plastic, ceramic, composite material, epoxy, glass, and other materials where ultrasonic waves are well transported. Measurement range: 0.04 - 7.9 inches (1.0 - 200 mm). Material sound speed: 500 - 9000 m/s. Display resolution: 0.01 mm. Measurement accuracy: ± (0.5% n+0.1) Minimum measuring pipe diameter and thickness: steel pipe 1 mm. 0x3.0 (depending on the probe used) Power supply: 4 AA batteries, Low battery indicator, Operating temperature: 0-+45°C, ≦90%RH Size: 120x62x30mm Weight: 7.1 oz (208 g) (not including battery) Interface: RS232C Standard Configuration: Main unit, 5M φ8mm standard probe, instruction manual, JIS inspection document, carrying case option, for measuring thin or small diameter pipes. 6MHz Probe High Temperature 5MHz probe PC software, RS232 cable for measuring