Let me begin by saying I know nothing about these. I have a Cen-Tech 92242 Digital Thermometer with K-type probe. This was a Harbor Freight special years ago, some of you may remember or even have bought one.
I stopped using it years ago when it stopped giving me a useful screen - I have one large line on the left side of the screen and not much changes, except when it turn it on it flashes a very large number - like 1587 when I have the probe in the air.
I just put a new battery in it to get this screen.
My question is, is the thermometer trash or is it the probe? Is there a test to tell the difference? I have never replaced the probe.
I am asking because I want to start annealing with sand and need a way to measure the temp, for obvious reasons.