Meter shuts off after 15 minutes, regardless of how long it is set to record data. Data is only recorded on the phone there is no memory on the meter. The bluetooth function on the AN9002 is almost completely useless. Bluetooth function is not stable. Buy an OWON OW18A instead. The OWON has onboard memory and will not turn off until the timer that you set has expired. I recorded for 6 days with an OWON using only one battery.
Good Product, and very fast delivery