Sinn M3.F Professional Pilot Watch with 80,000A/m Anti-Magnetic, -45°C to +80°C Temp Resistance, 20 Bar Water ResistanceSinn M3. F Description A measuring instrument developed with the harsh environments of professionals in mind. With an astonishing anti magnetic performance of 80,000 A m (1000 Gauss), Sinn's unique dehumidifying mechanism that protects the watch from moisture and stabilizes accuracy, temperature resistance from 45C to +80C, and 20 bar water resistance, this is a professional pilot watch equipped with the durability required for Sinn's (Sinn)