I bought 2 pcs for the server room and one for home to monitor the temperature visually One hung on the rack, lowering the thermostat inside The second along the wall, where the air flow passes to the server Placed in the kitchen at home all three have the same error of 0.2-0.3 degrees, but this, it seems to me, is more from the location. I am extremely satisfied with the purchase - cheap, functional, angry :)