This was an update for me. I used a cheaper model from Wal-Mart. The previous model of external transmitter did not hold moisture and corroded to the point of failure. This lasted about 3 years. This transmitter is much better, has a convenient handle for external connection. I actually only use one of the transmission blocks for the two inner blocks, so I have a second outer block to replace if it rusts. The temperature appears to be more stable at around +2 degrees Fahrenheit than near alcohol thermometers. I think the docs say + or - 2 degrees, I agree it's pretty close to the units I got. to those units and it was the right pace. it hasn't gotten colder here so I don't know what to expect in colder weather? I don't really use the High Low function, so I can't view that part. It seems to me to maintain good temperatures inside and out, a good deal for the price at Revain.
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