Get yourself a CO2 meter with an alarm to keep brewers safe and OSHA happy
Amazon.com: Basic CO2 Meter by Forensics | AB841 Compliant for Classrooms | USB Power & Battery | 10 Year Life | Air Quality CO2 Monitor | for Gyms, Offices, Classrooms, Home and Car | : Industrial & Scientific
Beer Carbonation Tester | GW Kent
CO2 Tester for Beverage/ Beer/ soft drinks/sparkling wine - - Amazon.com
CO2 Tester for Beverage/ Beer/ soft drinks/sparkling wine - - Amazon.com