The GLD/450 Plus is an easy to use, low cost combustible gas leak detector. It’s semi flexible shaft is useful for hard to reach places Semi flexible shaft with sensor at tip Self calibrating Pinpoints leaks as small as 50ppm methane Three LEDs and an audible ‘tick’ indicate increasing combustible gas concentration Supplied with 2 x AA alkaline batteries Battery indicator Don’t forget once you have purchased and received your KANE GLD/450 Plus, leave a "Customer Review" and share your thoughts with others.