Range of lenses not smaller than -20D to +20D with steps not greater than 1D.
Apertures: small, large and semi circle, fixation star.
Color temperature: Cool white in the range 3100-5500K
Light intensity: 8,000-12,000 lux
Dust free sealed optics and aspherical optical system
Red-free, blue, green, and polarization filters.
Handle with on/off switch.
Scratchproof lens; glass (preferred) or plastic
Batteries: AA or rechargeable
Battery life: at least 5 hours of use on full charge or fresh batteries
Set contained in a hard storage case.
Capable of being stored continuously in ambient temperature of 0 to 50 deg C and relative humidity of 15 to 90%.
Capable of operating continuously in ambient temperature of 10 to 40 deg C and relative humidity of 15 to 90%.
Liquid splash resistant
Weight: < 0.20kg without batteries
Supplied without batteries