MAHLE NitroPRO Nitrogen Purity TesterMAHLE NitroPRO Nitrogen Purity Tester The MAHLE NitroPro Nitrogen Purity Tester is an important accessory for any nitrogen producing source, not just the MAHLE NitroPro. If you're selling the benefits of nitrogen to your customer, you had better make sure that the machine is actually providing pure nitrogen, and not just a mixture. If the customer starts riding around on his new nitrogen filled tires, and starts to realize he isn't seeing the