If the wheelchair weight is unknown, place the wheelchair only on the platform; press REWEIGH. Enter the Automatic TARE by pressing the TARE button. 4. Move the wheelchair and patient onto the platform over the ramp until the front wheelchair wheels are stopped by the platform guardrail. The display should read “WEIGHING“ until the weight of the patient is displayed. 5. We recommend reweighing after the patient is sitting still on the wheelchair on the platform by pressing the REWEIGH button. 6.