Place the base unit wherever you desire, on the ground, hang on a nail, leave in the truck etc. Take the hand unit to your desired benchmark and press zero for two seconds. The measurement module will now read elevations above or below the benchmark.

Allow the measurement module to settle, press the hold key. The unit will make a series of beeps, when it stops move to next location. This key may also be used to freeze a reading in a place that does not have visibility, (e.g. down a dark hole, a cliff or stair well etc). By pressing the key and say lowering the hand unit by the cord the reading will freeze when the unit is stable and may then be hauled back up to be read.

Press the "Rec" key for 2 seconds. At each reading press the "Hold" key. The readings are then stored and may be viewed at your will, or downloaded into a PC. (The hand unit has a port).

In similar fashion to above further use of the "Rec" key will instantly give the maximum, minimum and average of the elevations taken. Ideal for cut and fill.

At the bench mark press and the "Zero" and the "Mark" key for two seconds. By leap frogging the base unit and the hand module and alternately pressing "Hold" and "Zero" you may measure elevations as far as your legs will carry you.

Press both "Res" and "On/Off" buttons automatically puts readings in high precision mode.