Home › Blog › Buying Guide › Smart Buyer’s Guide: How to Choose the Right Pre-Owned, Used, Secondhand, Surplus CNC Equipment Before Purchasing Gleason MAHR GMX 275 CNC Gear Measurement Tester Machine made in Germany Below is a Smart Buyer’s Guide for evaluating a pre-owned / surplus Gleason / Mahr “GMX 275 / GMX 275C / GMX 275 W / GMX series” CNC gear measurement / metrology machine (sometimes called “GMX 275” or “Gleason-Mahr GMX 275 / GMX 275C / GMX W”) (i.e....