Good evening. I recently was taught how to use our new water activity meter, and I noticed something strange. This meter uses changes in the reflectance of a mirror. Whenever we'd bring the sample up to temperature, the measurement would reach a low point, then at about 0.5° below our set temperature of 25°, the measurement would hit about 1.02 or 1.03. I'm curious if this is a quirk of the meter itself, or if there is a physical phenomenon underlying this. The underlying sample was a tomato paste with aw measured at about 0.99.