I have a couple of these, one on the outside of the RV in the shady side of the RV, and one on the inside of the RV. To reset the range the battery needs to be removed.
I have similar units in my DC refrigerator to track the temp range near the top at the front, and at the bottom back.
Top # is current humidity. Below that is minimum (low) and maximum (high) humidity since reset. Upper right on mine currently has a frowny face with DRY, as my current indoor humidity is 10% which is the minimum value. In Amargosa Valley it has to be raining, snowy or foggy to register any humidity above 10%.
On January 11 we had light snow on the ground in the early AM, and later outside the min/max was 23% and 86%, with 23% at 16:35. The nearby local Weather Underground station recorded 0.04 inch of precipitation for that day.
14.4 is the current temp in F scale, line below has the minimum and maximum temp since reset, a spread of 72.9.
The units can vary, they are not precise, they are cheap, with variations in readings, one was +2.3 F off from another next to it. Hard to know which was off or both.
