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I have two wireless thermometer's and they are not calibrated at all. One is 70 degrees to hot and one is 70 degrees to cold. Am I pretty much out of luck? I don't see any options for calibration on them.
The only way I know how to calibrate them is in your own head or on paper. You know how much they are off by, so you have to take that into account. I have one that is about three years old that reads 30* higher than it should. If yours has an option to calibrate it, it might help to know the brand and model type that you have. Good luck.
Call or e-mail the manufacturer and voice your concern........perhaps they can offer you a solution or even replace the units........you will never know until you try.
I would also call the manufacturer and tell them of your dilemma and see what they say. then if they don't do anything tell Ronp and see if he can help you. Just kidding but he has a nack for fixin things or getting them fixed.
As far as I know you can not calibrate a digital thermometer. We only use digitals wreer I work and they get tested daily in a cup of ice water, it should read 32 degrees. If they dont test to 32 we toss them.