Our pre-calibrated borosilicate glass capillary tubes are marked with a black calibration line at 60mm from one end.  The calibration line establishes a uniform blood column length. Treated with ammonium heparin, these tubes are designed for both safe blood collection as well as accurate micro-hematocrit determinations. 18µl capacity.

Packaging: 100 tubes per vial, 10 vials per box (1000 tubes per box).
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ID: 0.55mm +/-0.05mm
OD: 1.55mm +/-0.05mm
Length: 75mm +/-1mm
Volume: 18uL
Material: Borosilicate glass