Doing a bit of research this is what I found.
1. It's a reflected light meter with a wide angle measurement.
2. It uses a mercury battery.
3. The sensor on the UF model is Cds but since this one is UF II it could be silicon but I doubt it because it uses the same mercury battery.
4. It has 2 ranges selected via the sensor cover.
5. You simply read the light level on the meter then dial the value in the calculating dial to figure out f/stop and shutter speed.