HC-211 is a professional alcohol checker made for a market which must frequently use such devices (truck drivers, taxi drivers, heavy machinery operators. It has a removable mouth piece to accommodate multiple users. The design also implemented an easily removable chemical cartridge - a part which is responsible for checking the alcohol level and can be quickly used up if HC-211 is used frequently by multiple users.
Here it is for sale on ebay:
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=300863694027&item=300863694027&lgeo=1&vectorid=229466
This is HC-211 alcohol checker with a smoky transparent plastic cap designed to protect the alcohol checker's sensor from being fouled up by excess alcohol vapour.
These are some early concept sketches for HC-211 projects.
These are some early concept renderings for HC-211 project.
