Many film cameras have built in light meters, however; as the cameras get older their light meters often become more and more inaccurate. Some cameras, such as the Olympus OM1 or the Canon F-1, have light meters that were originally designed to be powered by mercury batteries. These are no longer produced, and while alternatives are available they are often not the correct voltage resulting in inaccurate metering.
KEKS Cameras is a company that I have been working with that supply external light meters that solves these issues.
The KM02 is a small, sleek light meter that can be attached to your camera via the flash mount. Simply set the ISO of the film that you are using then pick your preferred aperture or shutter speed and your KEKS light meter will display the best settings to use in order to produce a properly exposed photo. It also boasts features such as exposure compensation, multiple metering modes, customisable settings and more!
Their latest release is the KM-Q, a sugar cube sized light meter that weighs only 18.5g. This is a smaller, simpler light meter perfect for when you want to pack light. Available in black or chrome you also get the choice between a display on the rear of the light meter or on the top!