CO2 Inspection & Concentration certification. With our own line of of 0-100% CO2 meters.The only meter fast enough to even measure spot discharges and the only legal due diligence meter. We aslo mfg the patented "Ensured" unit that can ensure anyones ability save a hazard even if their system may fail. INSURERS NOTE: This can not only "save" any CO2 system from failure, and claims, it also proves where liability for any system failure really lies. Contact us for a Power Point presentation that grapically shows not only our Meters and more and how they work, but also " CO2 Systems and Why They Fail" , "Insane Insurance practices costing needless millions", and much more . On the web at www.CO2Central.com