Glad you got it sorted.
By the way, why not use a digital thermometer? You can pick up one with basic logging (max high/max low recording, alarm at specified high/low temps) for cheap and the single AAA battery will last you for like a year... which makes a 4 pack of AAA batteries cover the life of a F&P fridge ;)
I use one that looks very much like this:
... and it works a treat.