Nubee Temperature Gun Non-contact Infrared Thermometer w/ Laser Sight for $13.66. Shipping is $4.99 for a total of $19.65 shipped. Here is a screenshot for your reference. It takes temperature readings and features a red laser pointer for aiming. It is powered by one 9v battery (included). This is a convenient and inexpensive way to check for cold spots at home and to ensure the heater is working properly.