GM100 Ultrasonic LED Digital Display Metal Thickness Tester 5MHZ 4.5V

feature: * Auto-calibrate zero point to fix system errors * Linear automatic compensation using computer software to correct the nonlinear error of the probe in the entire range to improve the accuracy * Data storage/data query/data deletion function * Measure the speed of sound: directly measure the speed of sound according to the thickness of the sample block * Low battery indicator function * Automatic shutdown function * LCD backlight Specification: * Measuring range: 1.2~220mm (steel) * Accuracy: ±(1%H+0.1)mm * Resolution: 0.1mm * Sound speed range: 1000~9999m/s * Operating frequency: 5MHz * Lower limit of pipe measurement: Φ20*3mm (steel) * Power: 3 x 1.5V AAA batteries (not included) * Product net weight: 210 grams * Product size: 70*145*28mm Package Included: 1* Ultrasonic Thickness Gauge notes: 1. Due to manual measurement please allow 1-3mm error. 2. Due to the difference of different monitors the picture may not reflect the actual color of the item. Thanks!