Bests & Worsts Reviews from Amazon

Celsius-only digital thermostat. Works great, price right. I'm using it to turn a lightbulb on and off inside a warming box that keeps the box at a constant temperature, but for that it's perfect. Has two 10-amp 120 volt capacity relays: one for heating, one for cooling. The heating relay turns on (closes the circuit) when the supplied sensor reads 0.5C below the target temp. This setting is adjustable. The relay stays closed until the target temp is reached. The cooling relay turns on (closes) when the desired upper temp is reached, to turn on a refrigeration compressor. To protect the compressor, there is an adjustable compressor delay value. Four programmable values: 1. Target temperature (default: 10C/50F; adjustable from -50C to 99.9C) (-58F to 211.82F) 2. Difference (how far the temp falls or rises until the relay closes) (.5C is default); adjustable between .3C and 10C 3. Compressor delay time (1-10 min; 3 min default) 4. Temp calibration value The box is small - fits in your palm. It's designed to be panel mounted. Fits in a 71 mm x 29 mm opening. The orange things ratchet from behind to snug the box against the panel opening. They can be removed if desired. I posted a picture of the instruction/spec sheet, but it may not be readable. Too bad we can't post PDF. Relays are mechanical nonelectronic and audibly click when activated. No idea how many cycles they can take. The sensor is at the end of a 2-meter 2-wire cable. The sensor itself is about 1/4" in diameter and about 3/4" inch long.