Selenium meters that are kept cased or closed are often accurate and still functional.
Selenium meters appear to fail at a rate that is related to their exposure to sunlight or light. I have had some great experience with Selenium meters. Those good ones were very often acquired in everready cases which were always closed to stop light entry into the meter. Same goes for Selenium external meters that were cased and kept closed when not in use.
Look for a Trip with the nice leather ever ready case they came in. It will likely have a good meter.
Selenium cell meters were never really that great in low light, but for normal use in day ot day shooting, are extremely accurate if the camera was low usaga and the meter kept covered.
Often you will find Trips with the leather pouch that is clearly original. It says either TRIP or OLYMPUS on the front. can't recall which for sure. It's been a while. It's form fitting to the camera.