Hello Duane, Thanks for the note. I have now found out when the Mooshimeter’s device in range of IOS are continuously written data on the memory card although the IOS devices are in standby mode and before the app was not finished. The data is also written to the memory card when the logging funtion was not turned on. For me it’s a bug. It should only be data written on the memory card when logging is turned on. Only then should the data in the selected distance as 1 min are stored. If I every 1min written data and want to see between the current measured values and the IOS device turn on Saves the Mooshimeter back in short interval on the memory card. I forget the IOS app 1min stored data are to quit no longer useful. So in summary, as it should be. Is Logging off No data is written to the memory card regardless of whether the app is turned on or not and whether connection to the IOS device is. If logging is turned on, data at a set interval written to the memory card regardless of whether the app is turned on or not and whether connection to the IOS device is. If in a current logging a connection is allowed to Mooshimeter, the logging function which should not be affected. I just think it makes sense, the data record.