Review on Klein Tools ET10 Magnetic Digital Pocket Thermometer: Accurate and Portable for Temperature Monitoring - Orange by Terra Strickland

I don't understand how it can sometimes show 2 degrees off. It reads accurately for a minute, and the next time I use it, it's off 2 degrees. Although I like all the features. The magnet could be stronger on the back. It only sticks when you're still in the vent, it doesn't stick to the surface of the vent on the air filter. I think most reviews don't have any other theometer to compare it to. I love Klein but will not buy this product again.