Just a little warning to be on your guard folks. my kids bought me a digital tank thermometer for Xmas. Being an engineer I tend to try stuff before relying on it so I ran it in the tank along side my 'old fashioned' glass one. I noticed quite a discrepancy between the 2. Luckily I have a full range of calibrated test equipment for use in my work so I did some checks with that.
The digital thermistor is 7....thats seven!! degrees out!!!
Were this to have been my sole means of measure I would almost certainly have killed my stock trying to get the temp 'right'
The glass one is <1 degree out.
Please check you kit guys.
'Modern' is not always better....
:)