Can I use the Rapid RH® System even if the HVAC isn’t on?

ASTM F2170 specifies that the floor must be at service conditions (building and room enclosed and the HVAC running). Relative humidity is calculated with temperature, so a significant difference between the temperature of the slab when testing, and what it will be “in service” is an important consideration. However, relative humidity testing performed 40% below the surface of the concrete is less likely to be affected by the ambient conditions than calcium chloride testing or other surface testing methods, which are affected greatly by ambient conditions.

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