How do you zero the scale on a Hill-Rom® Stretcher?

How do you zero the scale on a Hill-Rom® Stretcher?
 

Adjusting the Scale to Zero

1. Put all necessary items such as linens, blankets, pillows, equipment, and other items on the stretcher.

2. Press the Enable control. 

3. Press the Zero control (0.0) until the Hands Off indicator flashes. The scale display will flash 

CALC until the scale is at zero. Then, the display will show 0.0 for both lb and kg.