Discussion Gas purity testing tips?

[Nocturna666]

I made a post about this before but didn't word correctly so here is the details. I'm using scuba and got the yellow f0ren$€c brand nitrogen purity detector for testing (brand names can't be specified on the forum) It's the same one though that gas monkey used. For this do you just put it under a flow of gas using a normal regulator and flow meter or do you need like a bag to contain the gas itself for proper testing?
I have seen a few different methods others used like just putting it against a small flow of nitrogen from the regulator hose, some claimed a sandwich bag.

 

[gasforme]

I tested mine like Vizzy using an oxygen tester inside the mask. Filling a bag with the detector in the bag seems the same.

 

[Nocturna666]

I tested mine like Vizzy using an oxygen tester inside the mask. Filling a bag with the detector in the bag seems the same.

You've been so helpful. Thank you @gasforme