Nikon 6154PFI AC-2S, 24X, Automatic Level With Flat Head Tripod and Inch Grade Rod, 8 Foot Built-in magnetic dampened automatic compensator levels the line-of-sight within the range of 16-Inch with setting accurate to within 0.5-Inch Horizontal tangent knobs have an unlimited range and can be operated with either hand A friction brake enables quick, easy setting and base plate designed for flat- or domed-head tripod mounting Water-resistant body construction allows use in light rain or dusty condition Carrying case included