http://www.techinstrument.com/PocketThermometersindex.html

This is a sample page.... the one I have is bi-metalic with and end reading analog dial.

I would think that 0-220 F would be fine at about $7..... like...

"1236-32
Pocket Test Thermometer, NSF. 1" Dial with polycarbonate lens, 5" Stem with red protective pocket sheath. Recalibrateable. Stainless Steel construction. Range: 0/220 F. MADE IN USA
Price: $6.30 "

but you can go to aircondition.com and check all the companies listed there....

I don't trust electricity so mine is bimetalic , 5 inch stem with sheath and one inch end reading dial....