Mechanical Timer - Ruck Determining the correct exposure time for instrument disinfection is tedious and imprecise. Easy and precise with this short time counter, adjustable up to 60 minutes: the end of the disinfection cycle is indicated by an audible signal. No batteries required, just wind it up and you're done. A little helping hand you won't want to do without. General features: • Weight: 75 g • Adjustable up to 60 minutes • No batteries required • Easy to clean