Calcu-Light X Digital Exposure Meter (CLX) by Quantum Instruments Light meter that reads reflected and incident ambient (non-flash) light. Measuring range: EV-3 to EV+21 (ASA 100).
Digital display: two digit LED numerals representing light value in 1/3 EV sequence of 01 to 64. By rotating the meter's calculator dial to the value displayed, every usable shutter speed and aperture combination is shown.
Blue enhanced silicon photodiode light metering cell. Memory recall of last reading. ASA range: 0.05 - 800,000 Shutter speed markings: 1 hour to 1/4000.
F/stop markings: f/0.7 - f/181. Batteries: MS76. Quantum Meters Optional Accessories: SX-1 10 Degree Spot Attachment, DX-1 Flat Diffuser, FOX-1 1" Fiber Optic Probe, SDX Swivel Studio Dome, DX-2 Diffuser/Enlarging Attachment, FOX-2 12" Flexible Fiber Optic Probe, MX-1 Microscope Attachment, HC-1 Hard Case CL/CF, FTS Flash Trigger Switch, CFC Calcu-Flash Replacement Sync Cord.