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

RA Series EN-3
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 rear). 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 rear of the
scale, then plug the AC adapter into a properly grounded power outlet.
2.5.2 Battery Power
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 twisting the two tabs 90˚
before pulling out to disengage the cover. Install the batteries as illustrated
on the battery holder. Re-attach the cover by inserting the tabs back into
position, then twist to lock in place.
If AC power is disconnected, the scale will automatically switch to battery
power.
Dispose of the batteries according to local laws and regulations.