Up for sale is a General Electric Exposure Meter with a Brown Leather Carrying Case. This vintage piece of equipment measures light. Light meters began with a system that relied on neutral density filters, letters and the human eye. Item was made in the USA by General Electric. It is made of a very durable and solid medal material and is in working condition. This meter is marked Type DW-68. The serial number is F45546. The US Patent No. is 2296670. It uses American Standard Exposure Index Numbers. It measures 2-1/4" x 3-3/4". Thanks for looking!