Digital thermometer

[smokinsmoker23]

So I have 2 dual probe thermometers like pic I attached. Had them bout 3 years I guess. I did a boiling water test and both read 212F so i know thier accurate as far as meat probe goes.One probe is bad I think because it went to 230F on both machines.
So I have 1 good probe n 1 bad n 2 good digital thermometers. My question is..... Is there a way to test the oven part of probe to see if it's accurate?
I'm probably gonna by me a new thermometer that I saw on eBay for $21 I think it was. Picture is what I'm using now with 1 probe but one I saw is different with 2 separate probes instead of one also pictured.
Thanks

 

[chilerelleno]

Yes, all probes can be tested in both ice water and boiling water.
If the probes are not waterproof simply do not submerge past probe/wire connection.

The air temp probes can be tested just like the meat probes.
Simply submerge about half the probe in cold/hot water to test.
They should read 32° in ice water and 212° boiling water.

 

[Rafter H BBQ]

Chile gave ya some great info!

I would just like to add that if folks are at a higher altitude... your test in boiling water won't go to 212*. I'll attach a link (provided to me by Dirtsailor2003) to calculate the boiling temp at different altitudes, simply type in your altitude & it will tell ya the boiling point at your elevation.

For example, I'm just shy of 5,000 feet above sea level... My boiling point is 203*

http://www.csgnetwork.com/h2oboilcalc.html

 

[smokinsmoker23]

My test did go to 212. Our altitude according to Google is 95' so that calculated to 211 using your link.
There actually we're 2 different answers according to Google 89' and 95' either way they both are 211.

 

[dr k]

2° ~ drop in boiling point every 1,000 ft. rule of thumb for the most part.