... reliably measures the thickness of the poured concrete slab of non-metal like structure,concrete,wall,girder,bar,pole,wood and ... thickness number)Work condition: temperature 0—40°C;Humidity: <85%Power source:Host 9VDC(6 AA battery),Transmit electrode 9VDC(Internal ... ×80mmExtension Bar:φ25×600(mm)(3 piece)Work PrincipleDJLC-A concrete thickness gauge is composed of signal transmit, connector, signal ...