... HRC, HRB, HV, HB, HS RS232 Interface SV-T201 Ultrasonic Thickness Gauge Handy, precise, excellent EMC performanceInstrument features:Standard parameter setting and ... alarming for the results beyond the limit. Working voltage: 2*1.5 V alkaline batteryWorking Time: about 150 hours(with ... if not working for 2 minutes, and the power key is also available. Display contents: thickness value, coupling state, ...