holding the hose on an injector, i stopped doing this when my hand almost set a light..
i look at flame picture on the hot plates and always analyze ovens.. few ovens ive checked have looked ok, but the co has been over 500ppm
cookers are the biggest killers, so i'd rather just analyze as much as i can rather than gas rate it..
if you dont put your manometer hose onto the injector, how do you know if the working pressure is correct, and what working pressure do you write down on your paperwork. the diy device i described previously ensures your hand does'nt get set alight. it's an ideal device for checking working pressure, it's not for inlet pressure or gas rating though.