Verify that the scale is level and stable. Load the scale a few times to align the internal parts. Place both poise bars on the zero indicators for each beam. The beam pointer should be centered on its indicator. If the beam pointer is not centered, adjust the balance screw to center the pointer.
After performing the weight (mass) accuracy task with a 200 lb (100 kg) load, add additional weights or sandbags until the load equals the scale's maximum load rating. Keep the scale loaded for five minutes and then inspect the chassis/frame/mount for any signs of physical stress. The weight indicated by the scale should remain with 1% of the test load