Plumb Bob Reference Line

Plumb bob reference line and fish scale

Plumb bob and fish scale

This line indicates when the horizontal arm of the BeeWeigh is level. To establish this reference line, secure the device in a vise, or something similar, such that the horizontal arm is level. The vertical arm should then be perfectly plumb and and at 90 degrees to the  horizontal arm. When the plumb-bob has stabilized, mark a couple places on the plywood backer board behind the line. Use a straight edge to complete the line. This line will then line up with the plumb-bob line each time a measurement is made with the horizontal arm in the level position.