Infrared Thermometer.  Digital, Non-Contact with infrared sight.  Features auto shutoff and data hold functions.  Range -58°f to 716°f (-50 ~ 380℃)

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 your standard 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 fermenation area and beer tasting samples.  If you’re looking for a standard thermometer, consider these two Top Finds: CDN DTQ450X – ThermoWorks Thermapen

Infrared Thermometer, Tacklife Non-contact Digital Laser Infrared Thermometer Temperature Gun Accurate with Laser sight – Auto-Shutoff – Data-Hold Function -58°f to 716°f (-50 ~ 380℃)