The TM1D Ultrasonic Thickness Gauge is dedicated to operate with single element delay tip transducers and is specially dieigned for measurement to thin materials. Measuring Range: 0.006 to .3000 inches or .15mm to 7.6mm (depending on transducer and material measured). The unit comes tih a serial output for optional printer or data logger and operates on 5AA alkaline batteries or a NiCad battery pack.