Digital Infrared Thermometer Laser Temperature Gun Non-Contact -50℃ ~ 400℃(-58℉~752℉)
Since this is no touch, you can check the temp of yeast washing and yeast rehydration water and your starter wort without the risk of infection. I find mine particularly useful for rehydrating yeast.
Infrared thermometers should not be considered a direct replacement for a conventional thermometer. A quality IR thermometer will give you a close approximation of surface temperatures. Note that steam seems to throw off readings. Uses include: Contained yeast rehydration water, chilled wort or starter temperature, kegerator, fermenter or fermentation area and beer tasting samples. If you’re looking for a great conventional thermometer consider Thermapen ONE – Hands on Review
Digital Infrared Thermometer Laser Temperature Gun Non-Contact -50℃ ~ 400℃(-58℉~752℉) – note that multiple variations of this product may be available, as such a different version may appear at this link