... 200mm(Glass) 4~80mm(High temperature), 3~50mm(Gray Iron) HIGH ACCURACY ULTRASONIC THICKNESS GAUGEThe ultrasonic thickness gauge Model ... -efficiency and designed to make accurate measurements on steel, cast iron, aluminum, red copper, zinc, quartz glass, polyethylene, PVC, ... Φ6mm)Display Mode:128×64 matrix LEDPower supply:2 AA Alkaline Batteries Operating Time: 280 hours typical battery life,100 hours ...