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By certification 
This analog wind up timer features a 60 minute Cook timer with a mechanical bell alarm. The unit is manufactured to the standard and does not require batteries.
Key Features
1.60 Minutes Max
2.Count Down Alarm
3.100% Mechanical Wind Up Operation
4.No Batteries Required
Applications
Mechanical timer for the laboratory
Used at facilities with limited access to replacement batteries (laboratory network levels 1-II)
General Description:
Timer, 60 minutes, mechanical
Product Description:
Mechanical, spring driven countdown Cook timer, professional use
Time setting via rotating the housing/ hand Ring or dial, easy to read, graduated 0 to 60 minutes, in 5 and 1 minute intervals
Loud long ring-alert at time elapse
Robust construction, housing, spring and gears: shock resistant
Can be positioned stable on a surface or clipped on clothes
Smooth finishing allows for easy to clean
Easy to transport, Light-weighted construction
Material: Mechanics inside made of steel
Housing: Housing made of easy-to-clean and resistant plastic
http://www.ileadtime.com/
