Instrument features: PENTAX optical system: super multi-coated lens, to ensure a clear and precise sighting; simple, powerful prism measurement functions: in addition to a prism, reflector measurement mode, it also has a Prism 550 m (POWER models); Let SD card slot: The real mass storage. Can easily and quickly back up data to an SD card, to further ensure security of data storage; numeric keypad: quickly enter numbers, letters and other special characters; Temperature Pressure automatically senses: auto-sensing ambient temperature and pressure, and automatic correction for improved measurement accuracy ; visible laser pointer: the sighting target faster, easier, and also convenient in the tunnel at night and other low light environments; Laser Alignment: You can adjust the laser intensity, the instrument is set up for the more convenient; Triple Focusing System : according to the requirements of the auto-focus, motorized focus, manual focus free choice of three modes; absolute encoder dial: no need to initialize the boot angle, reboot angle remains unchanged; standardized battery: Using cost-effective standardized battery design, was equipped with convenient; mass storage: memory can store 60,000 measuring points (XYZ), so that users can effectively accomplish any measurement and testing operations; built PowerTopolite powerful software, and load path software modules. Objective lens aperture: 45mm (EDM: 50mm) Magnification: 30 × Erect Field: 1 ° 30 'Resolution: 3 "Minimum focus: 1.0m distance measurement Prism: 550m reflective patch: 1.5m-600m Mini Prism: 1.5m-2000m single prism: 5000m prism: 6000m Accuracy: 2 "/ 5" Prism: ± (2 ± 2ppmxD) mm Prism: ± (3 ± 2ppmxD) mm Minimum reading: 0.1mm measuring time repeated measurements: prisms, SMD: about 2 seconds (1mm) tracking measurement: prisms, SMD: 0.4 seconds (1cm) Angle measurement accuracy: 2 "angle measurement mode: Absolute rotary encoders Horizontal: Vertical Duplex: Duplex Minimum reading: 5 "/ 1" Compensation: Axis Display Type: TFT LCD Monitor / 20 characters 8/240 × 96 pixel panel: two-sided 22-key Brightness settings: 10 order another battery: NI-MH rechargeable investigation Battery DC7.5V round bubble: 8/2mm long bubble: 30/1mm Working temperature: -20 ℃ ~ +50 ℃ Communication Interface: RS-232C; USB; SD Card slot Memory: 60000 Software features: Power Topolite software; Roads Software