Specification:

IIIumination :large Spot,Small Spot,Slit,Net,Red Free
Diameter of Filter:0.2mm-0.4mm
Dioptor Compensation:+/-0,1,2,3.4,5,6,8,10,15,20D,-25,-35D
IIIumination Source :3.5V/2.8W,Halogen Bulb
Power: rechargeable Battery(DC3.7V)

·Can also be connected with the head of ophthalmoscope(optional).
·The filament can be 360°rotated and upward and downward moved.
·Quickly and precisely measure the astigmatism axis.
·The light can be converged, radiated and paralleled.
·Continuously adjustable brightness.
·Convenient quick recharging.
·Anti-recharging and anti-discharging function protects the battery.

Specifications:
Rechargeable power supply.
Working Distance: 0.67m
Streak: 3mm-20mm
Illumination Source: 3.5V/2.8W halogen bulb
Streak Rotation: 360°
Li+ battery DC:3.7V

Specifications:

Working Distance :1m
Adjustable Range of Streak:0.2mm-0.4mm
Streak Rotation:360O
IIIumination Source:3V/2.1W,Incandescent Bulb
Power: AC220V/50Hz