Features: * Multi-mode: Pulse-Echo mode (used for flaw and pit detection) and Echo-Echo mode (used for measurements eliminating paint or coating thickness). * Using the latest high performance and low power consumption microprocessor technology. * Automatic memory material code and sound velocity value, convenient to use. * Use USB/RS-232 data output to connect with PC. * Provide Bluetooth data output choice. Principle& 65306; The digital ultrasonic thickness gauge determines the thickness of a part or structure by accurately measuring the time required for a short ultrasonic pulse generated by a transducer to travel through the thickness of the material, reflect from the back or inside surface, and be returned to the transducer. The measured two-way transit time is divided by two to account for the downand-back travel path, and then multiplied by the velocity of sound in the material. Specifications:                Unit System                 Metric system or British system (optional)                     Display                 LCD with backlight                     Range                 Pulse-Echo mode: (0.65~600)mm (in Steel)                     Echo-Echo mode: (3~60)mm                     Resolution                 0.1mm / 0.01mm / 0.001inch                     Accuracy                 ±(0.5%n + 0.05mm), depends on materials and conditions                     Measurement Period                 4 times per second for single point mode and 10 times per second for scan mode                     Sound Velocity                 1000m/s~9999 m/s                     Memory for up to 20 files(99 values for each file)of stored values                     Working Mode                 There are two working modes of thickness measurement: single mode and scan mode                     Operating Conditions                 Temperature:0ºC~40ºC   Humidity:<85%RH                     Power Supply                 4x1.