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