ultrasonic thickness meter with probe dia 8 0 mm 5 0 mhz for mild steel forged steel cast iro n copper specification 1 display 4 digit 10 mm lcd 2 range 1 5 to 200 mm 3 resolution 0 1 mm 4 accuracy 0 5 n 0 1 5 weight 250 grams with 4 x 1 5v aa um3 battery make smartech sup ertech acron warranty period 30 months after the date of delivery