Features * Wide Measuring Range and high resolution. With high power emission and broad band receiving sensitivity, the gauge can match probes of different frequencies. That makes it easy to measure the rough surface, even cast iron. It is widely used in almost all kinds of industries. * Applicable to measure the thickness of many materials, e. g. Steel, Cast iron, Aluminum, Red copper, Brass, Zinc, Quartz glass, Polyethylene, PVC, Gray cast iron, Nodular cast iron. * Used the exclusive Micro-computer LSI circuit and crystal time base to offer high accuracy measurement & fast measuring time. * 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. Specification Housing MaterialStrong,Light Weight ABS-Plastic Display4 Digit,10 mm LCD Measuring Range1.0~200mm/0.04~8 inch Resolution0.1mm Accuracy±(0.5%n+0.05) Sound Velocity500~9,990m/s Lower Limit of Pipes15x2.0mm 20x3.0mm Determined By Transducer OperatingTemperature0~40ºC ConditionsHumidity<85%RH Power Supply4x1.5V AAA(UM-4)Battery Dimensions135x65x27 mm Weight120g(Not Including Batteries) Package Included: · 1 x NEW TM-8816 Ultrasonic Wall Thickness Gauge PVC Steel Meter Tester Tool 1~200mm · 12 months warranty · 60 days money back · Life-time support.USB/RS-232 data output to connect with PC.