I ordered the same 3 small measuring instruments. All were delivered with full battery and showed exactly the same readings. By chance, I had to consider a calibrated temperature / moisture meter to hand to ensure accuracy. The difference in temperature at 25 ° C was 0.1 ° C For other ambient temperatures, I have not checked the difference. One of the devices ekes out his existence in my fridge and there for the past 3 months in constant operation. Another was placed with the sensor under the windowsill. Both the extreme cold as well as the relatively high heat at lunchtime make the unit from nothing.
