The Acids breakthrough indicator sticker type B (PN: 250) is a colorimetric indicator for the detection of traces of acids in air, suitable locations are the inside of window glass of chemical transport vehicles and the inside window of chemical storage cabinets where representative samples can be obtained. Weight: 0.4g (0.02oz), Dimensio: 2.0mm (0.11in), diameter: 38.1mm (1.5in)