Exposure meter made for use with easrly technicolor process. Cylinder 7.7cm diameter, 13.2cm long 3 diameter lens at one end with hinged flap with 1cm diameter hole. Output from photocell read by Westinghouse meter calibrated 0-20. Scale marked average stops. Raise flap: divide by ten. Optical frame finder with pin and ball back sight. Conversion tables taped to cylinder. Scale reading 1.0-16.5, conversion 2.5-41.25. No.25.