EZwaste Replacement Breakthrough Indicators come in a pack of 1, 2, 5, 10, 25, or 50.‘ Breakthrough Indicator is a qualitative colorimetric indicator for the exhaustion and end-of-service life of low-flow filters. EZwaste Exhaust Filters to mitigate health hazards and reduce harmful chemical emissions and odors from laboratory solvent containers. The indicator changes its color to red when the filter needs to be replaced. The indicator is designed to provide real-time indication of the breakthrough of HPLC solvents vapors, including:AcetoneAcetonitrileChloroformDCM/Methylene Chloride (Dichloromethane)EthanolEthyl AcetateHFIP HexafluoroisopropanolMethanolPhenolSulfolaneTHF (Tetrahydrofuran)SpecificationsHeight: 3.1″ (79mm)Diameter: 0.39″ (10mm)Operating Temperature: 4 C to 35 C (39 F to 95 F)Operating Humidity: 5% to 85%RHColor Change: Orange to redStorage Temperature: 4 C to 25 C (39 F to 77 F)Shelf life: 14 months at 4 C to 25 C (39 F to 77 F)