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Blood cell counters, operating on the principle of conductivity change, which occurs each time a cell passes through an orifice, are generally known as ________________

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Blood cell counters, operating on the principle of conductivity change, which occurs each time a cell passes through an orifice, are generally known as ________________

(a) optical method

(b) electrical conductivity

(c) coulter Counter

(d) microscopic method

This question was addressed to me by my school principal while I was bunking the class.

My doubt is from Transmission of Video Images in chapter Telemedicine Technology of Biomedical Instrumentation

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Correct answer is (c) coulter Counter

The explanation: Blood cell counters, operating on the principle of conductivity change, which occurs each time a cell passes through an orifice, are generally known as Coulter Counters. The method was patented by Coulter in 1956 and it forms the basis of several particle counting instruments manufactured by a number of firms throughout the world.

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