| 摘要 |
Means such as a piston-cylinder assembly (1) are provided for applying suction to a liquid, e.g. serum, to be measured. The liquid is maintained in a pipette tube or tubes (3) by suitable means (2). A pressure gauge (4) measures the hydraulic head in the tube or tubes (3). The or each tube (3) has a storage portion (3a) of relatively large diameter and a slender portion (3b) of relatively small diameter which prevents air displacement of the liquid.
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