Using optical levels or rotating lasers to survey elevations requires two people and a lot of legwork to set up the tripod, instruments and rods. The one-man Ziplevel works like an aircraft altimeter but is much more precise. It never needs calibration and does not amplify error with distance. The Ziplevel consists of a base unit that’s placed on the ground and a measurement module tethered by a cord to the base unit. Once you press the zero key on the measurement module it automatically calibrates the base unit as the zero point in the elevation and the measurement module’s vertical distance above or below this fixed point registers on its digital display. The cord extends in a 200-foot radius from the base unit. To measure elevations beyond the 200-foot distance you can leapfrog to new locations without the loss of your original benchmark.
One-man system calibrates elevations quickly
Dec 8, 2003