Pentax R-2501NS Instruction Manual page 37

Example: "TRACK CONT" at second MEAS (Factory default setting)
Collimate the telescope at a Target and press
[F1][MEAS] twice to start measuring the distance.
Upon reception of a reflected light from the target,
the instrument beeps and displays the mark to start
the TRACK distance measurement.
• If the instrument is in MODE B, press [F5][MODE] to switch to MODE A and press
[F1][MEAS ] twice.
• Pressing [F1][MEAS] twice after collimating the telescope at the Target starts Continuous
distance measurement at fast speed with the "MEAS" text blinking.
It remains blinking during the measurement. If you press the [F1][MEAS] again, Distance
measurement is completed and the "MEAS" text stops blinking.
• Pressing [F4][DISP] cycles through the sets of display items:"H.angle/H.dst./V.dst.",
"H.angle/V.angle/S.dst.", and "H.angle/V.angle/H.dst./S.dst./V.dst."
• Pressing the [ESC] or [F2][TARGET] or [F5][MODE] during fast distance measurement
stops it.
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