Sam Hopkins wrote:

They have one at radio shack which is the same thing as yours. Lots cheaper
too. The sensor is encased in plastic. I've used one for years.

Used a Radio Shack one for four years in a hot, corrosive film
processor. Closing the lid finally broke the wire to the sensor.

Bought one at Target for $9.99 recently; suspect it will give about the
same service.

DT