Environmental Express 37 mm MCE Air Monitor Cassette with 1/2" cowl features 0.8 �m mixed cellulose ester filter and crystal styrene housing. Cassette featuring stand alone design serves as a solid base for cutting the filter wedge and allows the user to position the cassette upright after sampling. Cassette ideal for lead and metals has a tamper resistant vinyl sealing band that will not loosen when exposed to high humidity or extreme temperatures. Cassette with 820 sq. mm filtration area is individually numbered for easy identification and sample tracking.