key to change measuring unit between pH and mV.
2.4. Backlight and delete key.
2.4.1. In measuring mode, short press(less than 1.5 seconds) this key to turn on or off
backlit.
2.4.2. When viewing saved data, long press(more than 5 seconds) this key to delete
saved data.
2.5. Increase and data view key. Decrease and data saving key.
2.5.1. In measuring mode, short press(less than 1.5 seconds) to save records,
short press(less than 1.5 seconds) to view saved records.
2.5.2. and are used to change parameters under setting mode.
2.6. Set and Confirm/return key
2.6.1. In measuring status, long press(more than 2 seconds) to enter parameter
settings.
2.6.2. Short press(less than 1.5 seconds) to confirm current selection in other status.
3. Save, view and delete data.
3.1. Data save. In measuring status, when the reading is stable and shows symbol ,
short press(less than 1.5 seconds) to save records, the screen will show “M+”
and storage number. The device can save 150 sets of records totally.
3.2. Data view.
3.2.1. In measuring status, short press(less than 1.5 seconds) to view the
newest saved record of the current unit, and right upper corner will show symbol “RM”.
Continue press or to replay all saved records.
3.2.2. In view status, press to return to measuring mode.
3.3. Delete data
In data viewing mode, long press (more than 5 seconds) and screen displays
for two seconds, which means all saved data is deleted already and back to
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