General Electric (GE) Type PR-1 exposure meter, a tool used to measure light intensity for photography. Here's a breakdown of its features and functions: 

Key Features:

* Purpose: Measures light to determine proper exposure settings (aperture and shutter speed) for film cameras. 

* Incident Light Meter: Can measure incident light by being pointed toward the camera from the subject's position. 

* Trident Analyzer: Features three markers to align the f-stop with the accurate light reading, one stop higher, or one stop lower. 

* Versatility: Suitable for various photography types, including color, black and white, stills, movies, interiors, and exteriors. 

* Portability: Known for its compact size and ease of use. 

* Analog Meter: Uses an analog display for readings. 

* Selenium Cell: Employs a selenium cell to measure light. 

* Compatibility: Designed for use with film cameras

Additional Information:

* Historical Significance: Introduced in the 1950s, it is a vintage piece of photographic equipment. 

* Durability: Known for being sturdy and dependable. 

* Applications: Can be used for various photography tasks

Untested, see photos.