Type: SDJ-02, SDJ-05, SDJ-10/20 Image: Erect Field of vies: 1°30 Magnification: 30X Clear objective aperture: 45mm Shortest focusing distance: 1.35m Resolving power: 3 Minimum reading: 1/5 Range of compensator: ±3 Accuracy of circular bubble: 8/2mm Accuracy of plate bubble:30/2mm Voltage: 4.8V Battery life: 15h Laser power: <1mw Facular diameter: ≤2mm Largest measuring distance:180munder sunshade daytime Central facular diameter:≤3mm100m