Lasergrip 1022 Non-contact Digital Laser Infrared Thermometer Temperature Gun by Etekcity. -58~+1022°F, MAX Display and Emissivity Adjustable by Etekcity.  Measures in Celsius or Fahrenheit (Range: -58℉~1022℉/-50℃ to +550℃).  Max temperature, auto off and hold functions along with low battery indicator.  Backlit display.

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

Etekcity Lasergrip 1022 Non-contact Digital Laser Infrared Thermometer Temperature Gun, -58~+1022°F, MAX Display and Emissivity Adjustable