Hold a David ruler in each hand and move alternately in parallel.^ Main function: It is used to draw the bearing line or route before the line, the degree of bearing line or the degree or measure line of the route.^ How to use: When moving, use appropriate force to suppress the static force of the hands and feet, and push the feet with one hand.^ Alternately move your feet in parallel until you reach the desired position.^ Alternate movement to prevent static foot displacement.
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