This is the BEST tool you can ever purchase for your reptile collection! Many great features including: zero to two hundred thirty degrees Fahrenheit non-contact temperature taking one second response and more.  You can find out the temperature in any square inch of all of your terrariums in seconds!  This is a must for every reptile keeper and your animals will thank you for it!Note: Specifications: Temp Range   -27.4 degrees F to +430 F Accuracy: + - 2% Feild of View:  1:1 optics ratio Battery: CR2032 Weight:  32 grams with battery