I want a gun that has a piece that fits right on the plug to guarantee I get a accurate reading every time.I saw a gun but it was like 300 bucks that has a piece that goes right on the plug.I dont trust one with a laser pointer,they arent that accurate when you factor in user error.You can move a gun from head to plug and see a difference,I want something exact where the reading is foolproof like the gun I saw with a tip that fits a plug tightly so there is no chance of a bad reading.