ALCO SCAN ALC-1 fuel cell alcohol breathalyzer is installed with a replaceable fuel cell sensor module. It provides accurate test result and easy maintenance of up to 1000 times. A compact design, easy handle and hidden personal mouthpiece. Alco-Scan ALC-1 alcohol breathalyzer is real professional portable breathalyzer with convenience for user. Sensor modules should be replaced approx. 1000 tests, or if damaged by improper testing or handling.