Patent ID: 8042567

Claim:
A gas meter for a valve of a gas canister and being adapted to mount between a vertical branch tube and a horizontal branch tube of the gas canister valve to be driven by a magnetic block that is movable inside the gas canister valve for moving an indication pointer of the gas meter to indicate a residual quantity of gas inside the gas canister, the gas meter being characterized in that the gas meter comprises a cylindrical container like casing that is magnetically non-conductive and forms at a top edge of a back thereof an inverted slope surface, an upper clamp extending from opposite sides of the inverted slope surface substantially in an upward direction to selectively and releasably clamp the vertical branch tube of the gas canister valve, the meter casing forming a side clamp corresponding to the horizontal branch tube that is set opposite to a horizontally-extending gas outlet tube of the gas canister valve, the back of the meter casing being recessed at a location opposite to and interfering with an outer top edge of the magnetic block enclosure to form a fitting groove that corresponds in shape to the outer top edge of the magnetic block enclosure, the meter casing integrally forming at the side where the side clamp extends an inclined arc wall connected with the side clamp.