Bacharach PGM-IR 3015-5696 Portable Leak Detector for Refrigerants and Carbon Dioxide measures carbon dioxide, nitrous oxide, and refrigerants with an extremely accurate 1 ppm resolution. The Bacharach 3015-5696 features an exceptionally long lasting non-dispersive IR sensor that typically lasts 5 to 7 years. The 3015-5696 also features the ability to datalog up to 200 readings, a built-in library of 50 different refrigerant types, a rechargeable lithium ion battery, and an innovative re-zeroing algorithm that allows the unit to work in contaminated areas.