The apparatus uses a biased electrode for attracting toner particles thereto, and a microprocessor based logic and control unit for sampling the mass of toner particles deposited on the electrode after the deposited toner particles have neutralized {HEAD ~ the electric field} produced by {TAIL ~ the electrode bias} 
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The apparatus uses a biased electrode for attracting toner particles thereto , and a microprocessor based logic and control unit for sampling the mass of toner particles deposited on the electrode after the deposited toner particles have neutralized { HEAD ~ the electric field } produced by { TAIL ~ the electrode bias }
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