About this item: Ultrasonic thickness gauge is an intelligent handheld thickness measuring instrument that utilizes the principle of ultrasonic measurement. This product is controlled by a microprocessor and measures thickness based on the principle of ultrasonic pulse reflection. When the ultrasonic pulse emitted by the probe reaches the material interface through the measured object, the pulse is reflected back to the probe and the thickness of the measured material is determined by accurately measuring the time of ultrasonic propagation in the material. Can quickly and non-destructive measure the thickness of materials. This product is suitable for a wide range of industrial fields, and can measure the thickness of high-density materials of different materials. It can also monitor the thinning degree of pipelines and pressure vessels after in use. It is a commonly used thickness measuring instrument in non-destructive measurement industries such as manufacturing, metal processing, and commodity inspection. Product parameters: Measuring range: 0.8-500mm Lower limit of the Pipe Measurement: 20x3mm/ 0.118inch (steel) Display: 4 digital LCD Display Minimum Display Unit: 0.1mm Working Frequency: 5MHz,denotes the measured thickness Accuracy: (01%H+0.1)mm Power Battery: 3 x AA Batteries Color: Blue & Black Material: plastic+metal Package Contents: 1 x Ultrasonic Thickness Gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.