The new instrument for taking readings of the hematocrit value from a blood sample has two electrodes with which the conductivity of the sample may be measured. The sample contacting faces of the electrodes are placed in a horizontal plane with an accurately fixed spacing therebetween so that a blood...http://www.google.de/patents/US4547735?utm_source=gb-gplus-sharePatent US4547735 - Instrument for measuring the hematocrit value of blood
