Western Enterprises ACU-200 Regulators, CO2/Argon, 0-60 CFH, CGA-580, 3,000 psi Inlet

Truly plug and play instrument. While label on packaging states that it is for 80%Ar/20%CO2, the calibration for 100% argon is included, and it is not that far from the mix calibration. A bit pricy but after breaking ball based plastic made flow meters this one is way more reliable and worth the money in the long run.

Works great

These regulators are amazing!!!!!!so easy to use and extremly quick to install and use.