Lavatools Infrathermo 1-Click Non-Contact Compact Digital Infrared Thermometer by Lavatools

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

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

Lavatools Infrathermo 1-Click Non-Contact Compact Digital Infrared Thermometer