Home › Shop › Syringes & Needles
Half-Unit Insulin Syringes, 0.3 mL
0.3 mL insulin syringes with a line at every half unit instead of every unit.
- 31G
- 0.3 mL
- ½-unit marks
At a glance
Gauge31GNeedle thickness. A higher number is a thinner needle: 31G is thinner than 30G. Glossary
Capacity0.3 mLHow much liquid the barrel holds. Smaller barrels have more space between the lines, so small amounts are easier to read. Glossary
MarkingsU-100U-100 means 100 units to the millilitre, so one unit is 0.01 mL. A mL scale is marked in tenths. Glossary
Smallest line0.5 unitWhat one line on the barrel is worth. Half-unit lines let you read 0.005 mL; a 1 mL syringe is usually marked in 2-unit steps. Glossary
Needle length8 mmLength of the needle. 4–8 mm is the usual range for under-the-skin use; longer is for muscle. Glossary
Needle connectionFixed needleFixed means the needle is built in (least dead space). Luer-lock screws on and cannot pop off. Luer-slip pushes on. Glossary
Needle includedYes
TipsharpBlunt tips draw liquid from a vial without being able to go through skin; they are for mixing and drawing up.
Dead spacelowLiquid left in the hub after the plunger bottoms out. Fixed-needle insulin syringes have almost none. Glossary
PriceMid-rangeRough position within its category, not a live price: budget is the cheapest sensible option, premium costs more for a reason the page explains.
TravelCarry-on friendlyWhether it is practical to fly with: carry-on means it goes through security without fuss.
SterileYesIndividually sealed and sterile until opened. Anything that touches the inside of a vial or your skin should be.
Pack100How many you get. Check this against the photo; Amazon listings often show ten and ship one.
ReusableNo
Amazon listing checked 2026-09-03: listing active and matches this description. Prices are not checked.
Same thing, different spec
Why you’d want it: The precision pick when your dose keeps landing between the lines.
Picking tip: The listing photos should clearly show ½-unit markings — that's the entire point of these. In the US and Canada the well-made ones (UltiCare, Elimedical) are sold labelled “veterinary”; it’s the same U-100 syringe.
- Category
- Syringes & Needles
- Also useful
- Build a full kit →