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For plastics or synthetic fiber, enormous number and type of high polymer are used in broad areas. As these materials are insulators, static electricity is easily generated and electrification is apt to occur in these materials, causing various problems. Because of this, the major task is to measure the electrostatic characteristics of these materials and devise a countermeasure. Static Honestmeter is a measuring instrument for attenuation of static electricity, most appropriate for investigating the diffusibility of static. This device is used to electrify the specimen by irradiating it by air ions generated by corona discharges initiated by the device, and then, after the irradiation is stopped, it is used to investigate the decay curve of the charge on the specimen.