Heater Or Thermometer?

[brownbread]

Hi there i have a rena 100watt heater in a 90l tank at 23-24 0c. However my thermometer says its only 20! WHATS WRONG HERE HELP!

 

[jarmado]

what type of thermometer do you use?

 

[dylema]

None of my heaters are very accurate, all a degree or two or three out. The heater in my 20g says 24 degrees but the thermometer says 27 (the temp is constant though).

If you have another thermometer try that and see what it says and adjust the heater according to the thermometer.

Hope this helps.

 

[brownbread]

I just use one that sticks to the inside

 

[jarmado]

I just use one that sticks to the inside

try another type of thermometer and compare the readings..