Negative numbers in my IHT-1P


When turning it on, I’m getting -37c

When putting it in boiling watter, it goes up a little bit but definitely not to 100.

Trying to calibrate did not help.

Is it broken?

May I know is it the first time to use it?
Has it been cleaned? Is there any water in it?
What would it read if you put it in boiling water?

No, I use it more than a year and I had no problem.

It is not wet and was not cleaned

In boiling water it shows 14c

It may be a problem with the product, please contact the seller for after-sales. If possible, please provide photos of this problem and order details so that they can process it quickly.