Detect potentially hazardous gas leaks in your classroom! No longer do you need to depend on your maintenance staff. You can now test for gas leaks every 3 to 6 months with this easy-to-use, highly accurate detector of combustible gases. Simply press the power button and hold the pocket-size detector near the suspected “leak.” The highly sensitive detector quickly provides both an audio beep and a visual warning. Detectable gases include natural gas, compressed natural gas, methane, propane, butane, liquid natural gas, and liquid petroleum gas. Small, lightweight size: 6-1/4" x 1-3/8" x 3/4". Powered by two AA alkaline batteries (not included).