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(above & below left) Here's a great accessory to go along with your jig. This laser-machinedplate, manufactured by Unijig, is designed to help make accuratemeasurements on all three planes. The plate is scribed with a large X/Ygrid, and the Z-axis caliper allows you to take accurate verticalmeasurements up to 30 inches. As with a jig, the key is to make sure theplate is level, or it will throw all your measurements off.