Prokit's Industries NT-6540 - Manual (Page 6)

Long press to switch off the device when it’s on.
2. Clear
Press once to cancel the last action or clear the
historical data, while taking measurements.
3. Measuring
Press to activate the laser. Press again to trigger
the distance measurement. The measured value is
displayed immediately.
4. Area
Press twice, the symbol appears in the display.
Press to take the first length measurement (e.g.
length). Press again to take the second length
measurement (e.g. width).
5. Indirect Measurement -Pythagorean
Press once, the symbol appears in the display.
Then take the first and second length, the result is
displayed on the summary line.
6. Historical storage
Long press to show the historical 10 records in
reverse order. Press and to browse the record.
Press the button to exit.
5