All AT-G series levels feature a magnetically-dampened compensator hung by four special mylar ribbons having superior resistance to cold, heat and shock. The AT-G1 through AT-G7 have a standard 360° horizontal circle. All models are waterproof with nitrogen gas-sealed telescopes to prevent clouding and moisture on the lens.

AT-G6 features include:

• Waterproof, sealed Telescope Construction
• 2 Speed Focusing
• Angular reading to 10 minutes
• Clampless fine horizontal adjustments
• Very short .5 meter focusing
• Easy to see circular level observation
• Rapid stable automatic leveling