Ohaus RE PRICE COMPUTING COMPACT SCALES Manual - Manual (Page 5)

RE Series EN-3
Install the weighing pan as illustrated below, with the pan properly aligned.
2.3 Selecting the Location
Operate the scale on a firm, level surface. Avoid locations with rapid
temperature changes, excessive air currents, vibrations, electromagnetic
fields, heat or direct sunlight.
2.4 Leveling the Scale
Adjust the leveling feet until the bubble is centered in the circle of the level
indicator (located on the front panel). Ensure that the scale is level each
time its location is changed.
2.5 Connecting Power
2.5.1 AC Power
Verify that the intended AC power source matches the AC adapter rating.
Connect the adapter to the power receptacle underneath and to the right of
the scale, then plug the AC adapter into a properly grounded power outlet.
2.5.2 Battery Operation
Dispose of the batteries according to local laws and regulations.
This scale can operate with six D-size standard alkaline batteries (not
included). To install, unplug the scale first from the power supply. Open the
battery cover (located at the bottom of the scale) by gently depressing the
two cover buttons, then install the batteries as illustrated on the battery
holder. Re-close the cover by gently inserting it back into position and the
two cover buttons snap into place.