How to Read a Syringe
A small U-100 syringe is marked in units. Knowing what a unit is, and where to read the line, makes every other number on the site easier to check.
On a U-100 syringe, 100 units equal 1 mL, so 1 unit is 0.01 mL. The reading is the line level with the edge of the plunger tip that faces the needle.
What a Unit Is
A unit is a measure of volume, not of peptide. U-100 means 100 units fill 1 mL. The scale measures liquid only. How much peptide that liquid holds depends on the strength of the mix, which is why the mixing guide and the calculator go together with this page.
| Syringe Size | Total Volume | Total Units | One Unit Is |
|---|---|---|---|
| 0.3 mL | 0.3 mL | 30 units | 0.01 mL |
| 0.5 mL | 0.5 mL | 50 units | 0.01 mL |
| 1 mL | 1 mL | 100 units | 0.01 mL |
Reading the Line
Hold It Level
Researchers commonly read a syringe at eye level, with the barrel horizontal or upright. Common practice
Find the Plunger Tip
The tip is the dark rubber part inside the barrel. Use the edge that faces the needle.
Count What Each Mark Is Worth
Marks differ between brands. Check how many units sit between two numbered lines, then count from the nearest number.
Convert to Millilitres
Divide the units by 100. A reading of 25 units is 0.25 mL.
Units and Millilitres
| Units | Millilitres |
|---|---|
| 5 | 0.05 mL |
| 10 | 0.10 mL |
| 25 | 0.25 mL |
| 50 | 0.50 mL |
| 100 | 1.00 mL |