Question About Co2 Regulator Please Help

Quick Question Just Wanted To Make Sure Well Running Your Co2 The Regulator Reads In Psi And Kpa But I Thought Your Suppose To Read In Ppm

the regulator will be psi with your bubble meter showing the flow rate.You then have to read the air co2 ppm and keep the area between 1200-1500 ppm od co2 in the air so you have to have a air meter or ppm controller or the cheaper co2 syringes keeping air temps between 80-85 f still doing full room air exchanges every 2 hours roughly.The regulator and flow meters are 1 part of the co2 usage setup