-8-FEATURESThe numbering of the productfeatures shown refers to theillustration of the instrument on thegraphic page.1. Rotating Laser Beacon2. Glass Lighthouse3. Control Keypad3a. On/Off button with Indicator3b. Manual Mode Button withIndicator3c. ADS Button with Indicator3d. Remote Sensor Window4. Battery Compartment Screw5. 5/8-11 Tripod Mount6. Charger Port7. Window for Plumb Beam8. Trivet Attachment for VerticalLaydown Positioning9. 5/8-11 Tripod Mount10. Mounting Clip with Lever11. Trivet Hinge12. Slots for Mounting13. Alignment Marker for LaydownPositionTECHNICAL DATADescription 3900HVAccuracy, Horizontal leveling 3/16-in at 100-ft(4.5mm at 30m)Accuracy, Vertical/Laydown 1/4-in at 100-ft(6mm at 30m)Working Range (diameter)- without Laser Detector, approx.- with Laser Detector, apprx.100-ft (30m)1000-ft (300m)Rotational Speed (with Remote Control Only) 0, 120, 300, 600 RPMLeveling Type (Degrees) Electronic (±5º)Beam Rating Class 2M 635nm