With our DT-550L you'll be up and working fast, thanks to its simple interface and large, easy-to-see backlit LCD. There's an optical plummet that makes set up over a control point easy, and a tilt sensor that provides ±3 minute angle correction. With a range of angular accuracies available, this Sokkia theodolite delivers precision, durability, and advanced technology to help you finish the job with confidence. The Sokkia DT50 is a lightweight, compact alignment and angular measurement device which boasts up to 30 workdays of power; the highest water and dust protection in its category; and convenient, high-precision laser guidance.