EXCELLENT for what they are, and accurate when calibrated.
For all those complaining about accuracy "out of the box" you have obviously had no mechanical training at all. Yes, these read all over the place when you get'em. That's why they are cheap. However, it is dead easy to get each and every one spot on. They are mounted on a thin plastic card. The scale is easy to read and the card, though thin, is durable enough to get the job done. The actual bulb tube is mounted to the card with two plastic clips. LOOK VERY CLOSELY at the °C side of the GLASS TUBE (not the plastic) almost around to the back side. You will see a tiny black marked etched into the glass. That black mark represents the 20°C calibration mark. Move that to line up with 20°C and move the plastic clips in to grip the tube at that spot... done. You can check this with a reference thermometer that is accurate and see that it works. The more accurate your reference the better. I used two K-type digital thermistor thermometers. Just adjust by sliding the clips up or down as needed . Now every single one is reading within 1/2°C of each other and that is close enough for government work. If you are running a physics lab, then look elsewhere. These work for me. Read more
