How to Make an Eyedropper Syringe

A calibrated eyedropper can function as a syringe.
••• BananaStock/BananaStock/Getty Images

When your pet is ill, you need an accurate way to measure the liquid medication. A graduated, needleless syringe is the ideal dosage measuring device, but may not be readily available in an emergency. Fortunately, an inexpensive eyedropper can be used instead. Eyedroppers, also known as medicine droppers, consist of a rubber bulb and a glass tube that tapers to a small opening. You can convert the unmarked eyedropper into a graduated syringe through a simple process of calibration.

    Check that the eyedropper is clean and dry. If necessary, remove the rubber bulb, wash the eyedropper and allow the bulb and glass tube to air dry. Reassemble the parts of the eyedropper before proceeding.

    Pour water into a measuring cylinder with 1 ml markings. Add enough water so that the distance between the water level and the opening of the cylinder is about half the length of the eyedropper's glass tube. Note the initial water level in the measuring cylinder, by reading from the graduated scale on the side of the measuring cylinder.

    Use the eyedropper to draw water from the measuring cylinder until the level in the cylinder drops to 1 ml less than the initial water level. If you accidentally extract more than 1 ml of water, gently squeeze the rubber bulb and release drops of water from the eyedropper back into the cylinder. Continue to release drops of water from the eyedropper, until the measuring cylinder water level is exactly 1 ml below the initial water level.

    Hold the eyedropper with the dropper end pointing downward. Use the permanent marker to mark the water level in the eyedropper.

    Empty the water from the eyedropper and allow it to dry. The eyedropper is now calibrated to serve as a 1 ml syringe.

    Things You'll Need

    • Water
    • Measuring cylinder
    • Permanent marker
    • Eyedropper

Related Articles

How to Measure the Volume of Gas Using Water Displacement
How to Fix MLA Pipettes
How to Convert Fluid Ounces of Water to Weight
How to Use Lab Pipettes
How to Measure the Volume of Gas Using Water Displacement
Glassware Apparatus & Their Uses
How to Measure the Volume of a Solid Object
How to Calculate Dilution Solutions
How to Convert Milliliters Into CCs
How to Measure Carbonation in Soft Drinks for a Science...
How to Make Homemade Glow Sticks
How to Dissolve EDTA in Water
How to Use a Micropipette
How to Make a 1% Sucrose Solution
How to Float an Egg in Water
How to Measure Mass & Density
How to Calculate Buoy Floatation in the Water
Definition of Endpoint Titration
How to Standardize a pH Meter
How to Use Water Displacement to Calculate Volume