Using a Dynamometer

Force measurements help you understand whether recommended hand and wrist force maximums are being exceeded in a job task. In turn, this information will help you determine direct causes and develop job improvement ideas.

• Use the pinch dynamometer to measure pinch force (opposing forces between one or more fingers and the thumb) performed during a task.
• Use the grip dynamometer to measure power grip force (when the thumb wraps around to meet the other fingers on the item) performed during a task.

When using the dynamometers, ask the operator to perform the task that requires force exertion. Then have the operator mimic the force required for the task directly on the gauge. Repeat this process until you have at least 5 measurements.

Keep in mind the following tips:

• Zero the gauge and reset the indicator after each trial.
• Adjust the grip span to match the size of the item being held during the task.
• Use the same hand/wrist posture that the operator exhibits when performing the task.
• The assessor should support the weight of the tool while the operator applies the force to the gauge.