Testboy-90-Gas-Leak-Detector-for-Flammable-Natural-Gases-&-Propane-Etc-Testboy-Testboy-90-P-The-Testboy-90-is-a-Gas-Leak-Detector-for-Flammable-Natural-Gases-&-Propane-ETC-The-compact-design-makes-it-ideal-for-use-in-confined-conditions-such-as-in-the-engine-compartment-or-in-heating-systems-The-presence-of-gas-is-indicated-by-coloured-LEDs-&-an-additional-acoustic-alarm-P-Testboy-90-Gas-Meter