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Protect your Coaxial Dynamics or Bird wattmeter sensitive 30 microamp meter movement by using this shorting blank when the meter is not in use. It will dampen the meter movement to protect it from impact and vibration that could damage or destroy the meter movement during shipping and handling. When the meter is not in use there should always be a blanking plug in the element socket. Precision machined from aluminum and Gold iridited to prevent corrosion. New, manufactured by Coaxial Dynamics. These blank plugs are not suitable for the side pockets on the Bird Wattmeters.