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Surface Resistivity Test Concrete Surface Resistivity Meter for Electrical Resistivity Measurement Concrete. Sponge plug type sensor to ensure good electrical contact. 128 * 128 large LCD screen display directly. Rechargeable lithium battery guarantees long time work. Keep test data function, continuously record, safe and reliable. With micro-printer for printing directly. Multifunctional PC will be easy to data storage and processing. Portable waterproof instrument box will be easy to carry.