Nailing the exposure when using your old film camera can be
Maybe the camera's built-in light meter is broken, the camera needs special batteries or it doesn't even have a light meter in the first place.
Leverage your phone's camera and Luxilux to determine the correct settings.
Rely on the advanced camera in your phone instead of 30-40 year old technology
Dial in your settings and immediately see the values for the correct exposure
No need to carry an external light meter with you when you can just use your phone
Use aperture priority, shutter priority or manual mode to accommodate your shooting style
Choose the shooting mode, full-, half- or third stop increments and exposure compensation
The developer is a film shooter for 15 years and knows what to expect from a light meter
Aperture Priority (Av) lets you choose the aperture and will select the matching shutter speed for the correct exposure.
Shutter Priority (Tv) lets you choose the shutter speed and will select the right aperture.
In Manual (M) you select both the aperture and shutter speed and the app will show you how far off these settings are from the optimal exposure.
If you have an iPhone or iPad that has multiple cameras you can change between them. Choose a wide angle to get an average meter reading of your scene, or choose a telephoto lens to narrow down specific parts of the image.
You can also use the pinch to zoom gesture to zoom in or out, even if your phone has only one lens.
Of course you can set the ISO of the film you are shooting. You can also set a compensation value, e.g. to accommodate for filters, expired film or shooting conditions.