If you're not showing anything at all on the tempurature side, it's defective. Contact the manufacturer and they will replace it.

I bought one of these Madelaine hygrometers last November and after setting it up according to their instructions, the hygrometer side of it was wayyyyy off. I contacted them and told them about it and they shipped a replacement immediately.

In the mean time, my wife bought me a nice 500 count humi for x'mas. It came with a POS analog hygrometer too so I read some reviews and settled on a Caliber III hygrometer.

http://www.amazon.com/Western-Humido.../dp/B0007W1EA6

Just FYI, I bought the Madelaine without reading any reviews because XiKar bought them out and I thought if XiKar liked them, they have to be good. I no longer feel that way about this hygrometer and if you care to keep reading, you'll see why.

All 3 of the Caliber's and the replacement Madelaine arrived the same day. The Caliber 3's are (according to their documentation) set from factory and do not require the salt test. In fact, the paper with the hygro says flat out not to do that as it could damage it. I put all 3 Caliber's and the 1 replacement Madelaine in my 500 count humi (without setting up the Madelaine) and all 3 Caliber's showed the exact same RH and temp the next morning. The Madelaine showed the right temp but the RH was about 15% lower than the Calibers.

So last night before bed, I put the Madelaine in a ziplock freezer bag with a water bottle cap full of salt with just enough distilled water in it to dampen the whole solution without leaving any water freefloating on top of the salt. I put the Madelaine in the bag, sealed it and set it on top of my 100 count and left it overnight. This morning, some 7 hours later, I pressed and held the green button until the RH display switched to 75%. That's how Madelaine says to calibrate this hygrometer. I pulled it out of the bag and set it in the 500 count humi with the 3 Caliber's and at lunch today (some 4 hours later, it was showing an RH level 10% lower than the 3 Calibers.

So, to sum up, I'm not overly impressed with the Madelaine hygrometer's and will never purchase another one of them again.

I do like the Caliber's and am glad I bought 3 because I'll have one for my 100 count, one for the 500 count and another for the 30 count travel humi I also got for x'mas (I love my wife).

Sorry if I ran on and bored anybody but I wanted to express clearly why I'm not overly impressed with the Madelaine digital hygrometer.