Regarding the protection class, the MF1921H is an improved version of the DS1921H Temperature Logger iButton.
Moisture Meter for Concrete and Wood
The Grant OQ610-S Concrete Maturity Meter is a compact unit, supplied in a very heavy duty, bright yellow water proof case, making it ideal for site work in all conditions and climates.
Based on state-of-the-art TRIME®radar technology it is possible for the first time ever to measure and analyse the water content, quickly, precise and direct on site.
Includes Data Logger