Do you know your machine's or customer's tire Nitrogen purity? Without one of these analyzers you could be putting air in the tires while charging your customer for Nitrogen. Verify that your technicians are filling the tires with Nitrogen. Analyzer comes with a restrictive orifice (to slowly sniff the Nitrogen) and a tire chuck. You can connect directly to most Nitrogen generators and to any tire. Analyzer will read up to 99.9% (remember to always top a tire off after using the analyzer as some pressure will be lost).