Datacolor SpyderLensCal SLC100 sound 2-3 VWorking Current：90 mA（Maximum）Working Frequency：268

2-3 VWorking Current：90 mA（Maximum）Working Frequency：268

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Or do you need to pass a music theory exam

bright light with no buzzing or flickering for maximum eye comfort

Datacolor SpyderLensCal SLC100 sound 2-3 VWorking Current：90 mA（Maximum）Working Frequency：268Datacolor SpyderLensCal SLC100 From the Manufacturer SpyderLensCal provides a fast, reliable method of measuring the focus performance on your camera and lens combinations. It allows photographers to obtain razor sharp focusing or check to see that their lenses are working at their peak performance. Sharpen your focus with the SpyderLensCal! Product Features Fast, easy solution for all your interchangeable lenses and recent DSLR bodies. Provides razor