The Pre-Owned Bertram Chronos Exposure Meter is a must-have tool for photographers working in darkroom environments. This reliable meter, manufactured by Ace Photo, ensures accurate exposure readings, allowing for precise control over the development process. It is ideal for photographers looking to achieve professional results in their darkroom work. The Bertram Chronos Exposure Meter is compact and easy to use, making it perfect for photographers of all levels. This essential darkroom accessory is a valuable addition to any photographer's toolkit, helping to ensure consistent and high-quality results in developing photographs.