Plumbing companies.

[Highpower]

I finished cobbling an adapter together. It's a bit crude but I was trying to keep it simple. I bought a solid rubber laboratory stopper and hollowed out about 1/3 of the large end. Bored two small holes through from the small end of the stopper and inserted a couple pieces of brass tube for attaching the plastic tubing. It's a little clunky having to hold it by hand against my meter's sensor port while the calibration routine runs, but it works. Good battery - check. Good calibration - check. Good to go again.