Nice job on the meter hardware and built quality – I am very impressed.
I am unable to get the logging function to operate properly. No matter what logging interval I select the meter seems to log at maximum rate (~3 Hz). I do get a readable CSV file but just too much data and semi-random headers inserted into the stream. The other strange behavior I have noticed is that the LED stops blinking when an SD card is inserted. I am using IOS 9.3.1 on a iphone 6s.
Keep up the good work.