100 µl Capillary Tube for HARBO Syringe (Pack of 5)

⚙️ Where it fits in the process

In the HARBO syringe the semen does not travel through the metal needle: it is collected and held in this glass capillary, joined to the micrometer by a short length of flexible latex tubing. The micrometer — calibrated at roughly 5.29 µl per turn — advances the column precisely; each queen receives a standard dose of 8 to 12 µl. The capillary is the working reservoir: it is not the tip that enters the queen.

📐 100 µl to the mark, ~130 µl real capacity

The column runs up to the black 100 µl mark; the capillary holds around 130 µl in total, and the tip retains a further 10-15 µl. Against the 50 µl format you double the semen available per fill: at 8-12 µl per dose you inseminate in the region of 8 to 12 queens before refilling. Since each drone yields barely ~1 µl, the larger capacity is the logical choice when you pool semen from many drones to spread the genetics across a controlled cross.

🔬 Glass, fire-polished at both ends

Glass is inert and transparent: it does not react with the saline diluent and lets you watch the semen column, the air gap that isolates it and any bubble — which would give a «spongy» response on the plunger and ruin dosing. Being fire-polished at both ends removes sharp edges, protects the latex tubing and — key in this format — lets you seal both ends (silicone cap, glass bead or petrolatum) to store the dose: semen keeps good viability for around two weeks at room temperature, better at 13 °C. Do not refrigerate or expose to sunlight.

🧩 Built for the HARBO system

It slides inside the protective glass barrel of the HARBO syringe and joins the insemination tip via latex, so swapping a capillary or a tip takes seconds — handy for clearing a mucus plug without losing the semen already collected. In professional practice it is treated as a consumable: cleaning the inside without compromising sterility is not viable, so it is replaced. Supplied in a pack of 5.

📏 50 µl or 100 µl?

· 50 µl — occasional work or a handful of queens.
· 100 µl (this one) — large batches, pooled semen from many drones and storing or shipping doses: fewer refills and fewer tubes to seal. Same HARBO system, twice the capacity.

⚠ This is not the insemination tip. This capillary stores, measures and doses the semen; it is not the glass tip that enters the queen, which is a separate, shorter part with its own latex connection. If you are after the delivery part, those are the HARBO glass tips.