[hamato]

Please let us know how the inline temperature probe works out! I just ordered an arduino to control my lights, and I'd love to be able to get my temperature probe out of the tank. I might try something similar.

Here's how I do mine. Works pretty well!

 

[hamato]

I got it from ebay, basically the waterproofed ds18b20 but the shorter version. An ebay search for "mini Thermometer waterproof model temperature sensor temperature probe" will bring it up.

For the fitting I used a Heyco M4518 RLTCG 1/2 NPT BLACK-NO NUT