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konastab01-
Carefully look at the photos you shot using the app and decide whether it gave you good results?
I think they're really quite good, paired with some common sense; taking care to deliberately point the thing to the specific object / area you want metered, play around a bit etc.
I went on a vacation once and had a Canon DSLR with me I used for a few occasional snaps, but mostly for metering the Hasselblad I mainly shot with. Later I found out that these apps are a thing, downloaded one and compared it's reading against those of the DSLR. I got very comparable results.
salad
When I needed an external meter in the past I just used a free iPhone app.
Worked great.