Match instruments P manometer, Q rotameter, R tachometer, S haemocytometer to measurements 1 agitator speed, 2 pressure difference, 3 cell number, 4 air flow.
A manometer compares pressures, P–2. A rotameter measures flow, Q–4. A tachometer measures rotational speed, R–1. A haemocytometer uses a known counting volume for cell-number estimation, S–3. Thus C.
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