The Wagner C555 Handheld Concrete Moisture Meter Kit with On-Demand Calibrator, 890-00555-001 is Wagner C555 Concrete Moisture Meter provides fast, non-destructive preliminary moisture measurements on smooth, firm concrete to help pinpoint problem areas and determine where to place Rapid RH L6 Smart Sensors. With its built-in ambient sensors and included On-Demand Calibrator, The Wagner C555 Handheld Concrete Moisture Meter Kit with On-Demand Calibrator, 890-00555-001 is C555 comes with everything you need to perform The Wagner C555 Handheld Concrete Moisture Meter Kit with On-Demand Calibrator, 890-00555-001 is test as outlined in ASTM F2659.