They are particulate filter classes from two different schemes

1 x Calibration Check Salts

Not to be used on skin

washable ink

Leather production involves complex multi-step processes where moisture must be closely monitored and controlled

Hygiena UltraSnap ATP Surface Test Swab (2000pk) (80 X 25 SWABS) Base UOM:2000PK They are particulate filter classesPRICE INCLUDES THERMAL PACKAGING & ICE PACK FOR SHIPPING Hygiena UltraSnap is a user friendly, all in one ATP sampling test used with Hygiena luminometers. Hygiena UltraSnap is a pen sized sample collection device that is easy to use, small, and environmentally friendly. UltraSnap is a user friendly, all in one ATP sampling test used with Hygiena luminometers. This pen sized sample collection device is easy to use, small, and environmentally friendly.