The DE Laser Series model numbers that reflect angle accuracy and have common features. All models have laser plummet, dual displays, and a detachable tribrach. The DE2A has 2", the DE5A has 5", and the DE10A has 10"angle accuracy. Horizontal and vertical angles can be observed simultaneously on the large 2 line, back-lit LCD displays. Other standard features include a horizontal angle zero set, automatic power off to conserve batteries, and a battery life indicator on the LCD display. Features 1. Incremental code system is adopted and two sides of LCD display plates can save power and display clearly. 2. High integrated electronic boards and all famous IC elements are high quality. 3. Steel axes imported lubricating oil and metal shell are adopt