The AlcoMate REVO is a Police Caliber fuel-cell breathalyzer with a HUGE advantage over any other model on the market. Consistently rated as the best breathalyzer for drug and alcohol clinics, businesses and professionals who can''t afford the down-time needed by ALL other alcohol breathalyzer models that must be sent back to the factory for annual calibration. The REVO is made by AlcoMate, the same company that brought you the Wired Magazine Editors' Pick AL9000 portable breathalyzer. It uses the same "wickedly accurate" fuel-cell technology with ONE BIG ADVANTAGE. When it's time to recalibrate you just swap out the PRISM sensor cartridge with a new one in less than a minute! Putting a new sensor cartridge in the breathalyzer instantly puts it back to factory-new calibration saving the user the downtime and aggravation of professional calibration. And the AlcoMate REVO breathalyzer will deliver 1,000 tests plus before you need to replace the PRISM sensor. The AlcoMate REVO Fuel Cell Breathalyzer With User-changeable Sensor Cartridge Includes REVO Fuel-Cell PRISM Sensor (pre-installed), 5 one-way flow mouth pieces, 2 AAA Batteries, Carrying Pouch with Carabiner, Hard "Clam Shell" Carrying Case, Instructions, BreathalyzersUSA AlcoMate Dealer Support & The Consumer's Guide To Breathalyzer Testing, a great overview of how to test properly to help keep yourself, family and friends safe and avoid a DUI.The AlcoMate REVO is DOT, FDA, NHTSA and US Coast Guard approved. It is an excellent choice for police departments, drug and alcohol clinics, schools, businesses, military and consumers who want the most accurate, easy to use and convenient breathalyzer on the market. If you want a breathalyzer with "police caliber" accuracy, total convenience (never have to ship your breathalyzer back for calibration) and super easy to use then click the orange "Add To Cart" button now.