Wenhan Beer CO2 Tester should be used.It is convenient.It has high accuracy, physical testing and SUS304 production. It's a great way to measure carbon dioxide levels. Key Features:Accurate CO2 volume testingPrecise measurement for perfect carbonationPrevents wasted kegs and unhappy customersExpertly crafted for professional useSpecifications:Color: SilverMaterial: Stainless steel 304 or stainless steel 316LSize: Compact and portable Standard: DIN/SMS/ISO Main Products: regulating valve, breathing valve, adjusting relief valve, NPT 1/4 exhaust valve, ball regulator, sampling valve, foam eliminator, carbon dioxide guage, center valve, manway, pressure gauge, thermometer, fitting and pipes, cleaning ball, butterfly valve,check valve, ball valve, screen gasket, valve products. Product Name Co2 Gauge Model No. WH-5108 Power Manual Standard DIN/SMS/ISO Material SS304 / SS316L Size 400*170mm Customized Supp…