| 摘要 |
Particle characterisation apparatus working on the Coulter principle is provided with a count wafer formed by micro-machining of silicon so that the count wafer can economically be incorporated in a disposable housing (10) adapted to contain and retain for disposal liquid pumped through the count wafer during particle characterisation operations. The housing may incorpora te electrodes (38) (4) in each of two chambers (22, 24) separated by a wall (20 ) containing an orifice (36) formed in the count wafer.
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