Darkroom Thermometer Dial

This is a fine thermometer for photo processing. The temperature scale doesn't go from the extremes of high or low, but rather focuses on those temps you're likely to use/need for B&W or color processing. Being metal you don't have to worry about it breaking, as has happened too often to my glass thermometers, and should it get jarred you can recalibrate it easily. It appears NOT to be waterproof, so don't let the whole thing fall into a water bath. Use reasonable care and you should get many years of accurate readings from it, and at a cost far lower than many of the alternatives.