The AlcoMate Premium Hard Case, includes a free additional sensor chip, is our new flagship alcohol breathalyzer that combines advanced PRISM (Precalibrated Replaceable Intelligent Sensor Module) technology, professional accuracy, and modern design into a convenient, easy-to-use alcohol breathalyzer device. The AlcoMate Premium is suitable for health and law enforcement professionals, as well as pro-sumers seeking a top-notch alcohol testing product. Introducing PRISM Sensor Technology With the new AlcoMate Premium, ASC is offering to you the most advanced, accurate and convenient breath testing system available. PRISM Technology provides by far the highest quality replaceable sensor module components using the most rigorous standards of construction, durability and accuracy. The method of exchanging sensor modules is also easier than ever with the Easy-Replace Sensor Panel on the back of the breathalyzer. Now sensor replacement is faster than ever, and literally takes just a few seconds! PRISM Technology is only available with the AlcoMate Premium.