This ultrasonic thickness gauge has an easy-to-read lcd display and is designed to measure the thickness of 10 preset materials. The tm-8811 features a built-in calibration function low battery indicator and includes couplant. Features ul style""margin-top 0px; padding-top 5px; padding-bottom 5px;"" measures the thickness of steel cast iron aluminum red copper brass zinc quartz glass polyethylene pvc grey cast iron and nodular cast iron easy-to-read lcd display displays sound velocity at the touch of a button automatic material calibration user selectable unit of measure (in/mm) low battery indicator package content ul style""margin-top 0px; padding-top 5px; padding-bottom 5px;"" ultrasonic thickness gauge ultrasonic couplant gel probe hard carrying case batteries