Ninja Dosimeter cards show the UV-C exposure that a surface has received.
They are an important tool to develop and maintain housekeeping SOP’s.
The test-area on the card changes colour gradually as it is exposed to more UV-C light.
When the test-area has the same colour as the second block, 99% disinfection is achieved.
In 20-30 seconds, the test-area turns white again and the card is ready for use again.