05-30-2013, 10:17 AM
Yes, at very high and very low RH%. This would usually require extended exposure to this environment. The key word to remember here are lag and temporary. In high RH% environments, IF hysteresis is in play, the sensor may lag behind temporarily until the true RH% goes below say 90%. As CC stated, we recommend if you know the slab is going to be high (i.e poured 45 days ago) then do a sampling to begin with and then if there is a question, add more towards the end. Hysteresis is not an absolute.