Voltcraft gd 3000 gas detector voltcraft gd 3000 p the voltcraft gd 3000 gas detector is an independently operating and extremely sensitive alarm system the device consists of a gas sensor an acoustic signal transmitter a visual status indicator and a power supply the device responds to natural gas and propane p p it is used to detect gases escaping out of small holders of liquefied gases such as camping gas cartridges gas lighters gas operated soldering irons etc this device is