How about this for 10 dollars? There is a 1 or 2 minute delay on temp change.

http://www.fish307.com/vexilar-deptherm/

Cody Note: I have one of these and when I checked it with my National Bureau of Standards mercury thermometer, the deptherm was not real accurate. Be sure to calibrate to several temperatures if you get one.

Last edited by Bill Cody; 04/16/16 08:36 PM.
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.