Unlike a rotary laser, ZIPLEVEL lets you truly work alone to quickly and easily level and read elevations directly in unmistakably clear digits. NO MORE rods, tripods, sensors, line-of-sight, error with distance, factory calibration and tedious computations. Now you can measure over any distance or elevation on earth, from paper thickness to the height of a mountain without error-inducing tabulation and math. ZIPLEVEL is the Worlds only bubble-free altimeter pressurized to prevent continual error-inducing bubble formation during storage, stepping on or kinking the Cord. Decades proven by tens of thousands worldwide who depend on ZIPLEVEL as the "tape rule" of elevation measurement. Fast, powerful, proven, rugged, reliable, affordable and made in the U.S.A. Cut costs, boost profits and join the measurement revolution. Whether youre supplementing or replacing a laser, you cant afford to be without ZIPLEVEL.