Features: It is transmitted at a constant speed and can distinguish waves reflected from the back side for this instrument. It can also be widely used in manufacturing, metal processing, commodity inspection and other materials that allow ultrasonic waves. Wide application: The ultrasonic thickness gauge is suitable for the material that conduct and reflect constant sonic velocity, such as metal, plastic, ceramic, glass, etc. The Intelligent Handheld Ultrasonic Thickness Gauge is microprocessor controlled and can measure thickness quickly and accurately and with sound velocity of various materials without ultrasonic measurement damage. This tool is capable of accurately measuring parts in different materials or industrial production, as well as monitoring pressure vessels for pipes and production equipment, as well as the extent to which various parts are corroded. Specifications: Condition:100% Brand New WT100A WT130A Measuring range 1.00 - 225.0mm 1.00 - 300.0mm Data storage 500 1500 Probe selection X V Operation frequency 5MHz 5MHz/2.5MHz Measurement error ±(0.5%H+0.05)mm Lower limit of pipe measurement 020x3mm (steel) Adjustment range of sound speed 1000 - 9999m/s Temperature range of operation 0 - 40°C Battery 3 Ni-MH rechargeable batteries of 1.2V USB charging 5V 1A Dimensions 65*146*30mm/2.6*5.7*1.2in Weight 130g/4.6oz Probe Measurement parameters Measurement parameters 5Md10 1.0 - 225.0mm 1.0 - 300.0mm 5Md6 X 1.0 - 50.0mm 2. 5M X 1.2 - 300.0mm High temperature X 1.2 - 300.0mm Package List: 1* Ultrasonic Thickness Gauge 1*Plastic Box 1*Instruction Manual 3*Lithium Battery 2*Probe 1*USB Data Cable .