Product review (4 stars): NO CONTACT INFORMATION
I received the thermometer two days prior to date I was expecting it.  Every thing set easily except for the C/F. I  had a really hard time setting that. I decided that I would call Qooltek for assistance. That was not possible even though the card that came with the thermometer said to contact them, There was no contact information. I even went on line and did not find a way to contact them. The package the thermometer came in did have an address. I would suggest that Qooltek put contact information on the instruction sheet.