Sekonic Micro Reder, a standalone light meter. It's battery-powered, and I've confirmed it works after replacing the battery with a new one. Being battery-powered, it starts up quickly and can accurately measure exposure. Comes with a leather case, so you can use it with peace of mind. It's compact and very convenient for measuring the correct exposure for cameras that don't have a light meter, such as the Kodak Signet 35 and ROLLEIFLEX SL66 currently listed. Further discounts are available for bulk purchases. Thank you for your consideration.