Specification :

AT-G series levels feature a wet magnetic compensator hung by four special mylar ribbons having superior resistance to cold, heat and shock. AT-G1 model features a 360 ° glass horizontal circle using a 25x magnification microscope to read the circle, while the AT-G2 through AT-G7 have a standard 360 ° horizontal circle. All models are waterproof with nitrogen gas sealed telescope which prevents blurring and moisture on the lens