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Shipping Policy : Battery and Liquid not included during the shippingDM200C wall surface moisture meter: the instrument is mainly used for laying floors, paint paint, floor paint, architectural decoration, the construction site of the ideal instrument.The instrument can measure the moisture products more widely, mainly the following: walls (walls, walls, tiles), ground (floor, cement floor, epoxy floor, concrete), gypsum board, marble, ceramic tile, floor tile, mud. DM200 Concrete Moisture Meter Work principle This instrument adopted the high frequency principle based on the introduction of the most advanced technology from foreign country. In other words,there is a fixed frequency inside the equipment. Once the moisture of the detected objects carried, the frequency through the sensor will be different. The deference between the frequencies will be displayed in figure after the conversion by current-frequency converter. Technical Specifications *Display: large screen with backlit LCD LCD digital display *Measuring range: 0~50% *Display accuracy:0.1 *Measurement environment: temperature: -5℃~60℃; humidity: