siwetg Digital Thermometer Dual Screen Temperature Sensor Tester Red + Blue Waterproof Metal Probe NTC

Very nice little dual temperature sensor/display. Very bright, I have connected it to a 9 volt 500mA plugtop PSU and it's on permanently monitoring a tropical fish tank. It's at least as accurate as the glass tank thermometer I was using and a lot easier to see if attention were needed. Great price @ £3.85 plus 99p postage. Please note it's designed to fit in a panel cut out, I've just duck taped it to the tank lid.

The display is clear and and big enough to be read from across the room. It is being used as an inside/outside sensor so the red/blue display is ideal and seems to agree on the inside reading with a nearby room thermostat. I found that it runs down a 9 volt battery fairly quickly so it is now powered by a 6 volt power supply. Good value fo money really, I can't see why the apparently same product is sold at a much higher price from another source. No problems with it so far; a useful little gadget. For my application it is a bit limiting by the length of the sensor cable... I guess I could easily extend the outside sensor cable but it would be appreciated if an extension lead were available.