This 2 in 1 Tool: Thermal Leak Detector + Infrared Thermometer, originally $49.95 is now $12.99 at Tanga. Shipping adds $2.99, but this is still the lowest price we found by at least $10. This beats our last lowest price by $4. This tool will help find hidden energy leaks and identify where the cold/hot spots are in the walls of your home. In addition, you can check the temperatures on surfaces you cannot touch, such as grills, ovens or engines. This operates on 2 AAA Batteries, which are also included. Sales tax is not charged in most states.