Chamber: two 1/2" hydraulic couplings
Barrel: something i took from a regulator
Mix: i have used 5x (first shot

Material, chamber: two 1/2" brass nipples and two 1/2" stainless couplings
Ignition: the good old camera cap dumped into a coil
Spark gap: 7mm but i think it takes the shorter way into the walls when it has 5x more resistance
Burst disk holder: i made it myself, works better than a union
i did not make this to turn out good or look pretty, as said the only reason i made it was to test the meter.
sorry for the mess on the pics, the cloth is there to hold Larda scratch free, and it is a good place to sit screwing fittings into eachother
DYI: you wasted your money. my gauge cost $20 and works after it got a 5x on it when i left the valve open

so do you guys have some feedback?
Edit: vid are in, no you can look at my mess

[youtube][/youtube]