The lotion is made to look like dirt and glows under a special light, allowing you to check whether you are washing your hands properly.
41657 is a lotion that checks whether the alcohol hand sanitizer is applied to the entire palm of the hand without leaving any residue. Model number: 41338
Specifications: 1 set
Set contents: 1 unit, 1 black light LED (4 AA batteries included for testing), 1 bottle of hand washing soap solution (250 mL), 2 bottles of hand washing checker lotion (250 mL)
