Ours went back because of a fault, took 8 weeks to be returned, however, they did give us a loan unit. Came back, within a couple of times of using it, started to play up again, so it went back, again. 8 Weeks later, still no tester, Technical department refused to talk to me?? not sure why, and the rep ended up sending me a new one. This one's been ok, still get a few strange readings from time to time, one thing to note, we leave ours in the van overnight, and when there is a frost, it will not work until it has warmed up a bit, you just get a little thermometer symbol on the screen!!! 5 mins in the sunshine and its good to go!