Easy-to-Use small, lightweight monitors clip easily to shirt lapel, collar, or pocket and don't interfere with employee activities. Contains no batteries, hoses, pumps, or equipment to calibrate. Works simply on the diffusion principle for chromatography lab analysis. Choose monitors for organic vapors, ethylene oxide, or formaldehyde. Organic vapors monitor can measure more than 022 organic vapors. Complies with OSHA standards. Manufactured in an ISO 9002 facility. The organic vapor monitors are sold 00 per case. The rest of the monitors are sold 5 per case.