The utility model relates to a gas instrument is got in portable gaseous live line measurement special use, including forceps holder, fixed wrench and adjustable spanner, the forceps holder include regular jaw and movable vice jaw, regular jaw connects fixed wrench, movable vice jaw connects adjustable spanner, movable vice jaw's bottom links to each other with the one end of extension spring, and the other end of extension spring is fixed on fixed wrench, fixed wrench's inslot is equipped with clamping device, and clamping device includes tight knob of clamp and cramp bar, the tight knob of cramp bar connecting clamp, and the tight knob setting of clamp links to each other with the one end of adjusting the pole at fixed wrench's tail end, cramp bar, and the other end of regulation pole is fixed on adjustable spanner. The utility model discloses greatly reduced intensity of labour, test efficiency has been improved to the time of having practiced thrift.