A dropper can make handling a small amount of oil easier than tipping the bottle. The useful first check is fit: choose the dropper for the bottle you already have.
Match the bottle before choosing
Aroma Tierra specifies its Glass Dropper for 100ml bottle for the brand's own 100 ml glass bottle. The 100 ml refers to that bottle size, not the amount the pipette holds.
Do not assume that every 100 ml bottle has the same neck or closure. Check the bottle brand and size, and keep the original cap until you have confirmed a proper fit. Aroma Tierra also lists separate droppers for other bottle sizes.
Keep the handling simple
Work on a stable surface with the bottle upright. Keep the glass tip clear of skin and other surfaces, and return the dropper to its own bottle rather than moving it between different products. Handle the glass carefully and stop using it if it is chipped or cracked.
Follow the oil's own directions for how it may be used. Adding a dropper does not change those directions or make an oil suitable for a different purpose.
Check measurements separately
The manufacturer describes this as a handling accessory and does not state a calibrated measuring capacity on the product page. If your instructions require an exact volume, use the measuring equipment they specify rather than treating a full pipette as a fixed amount.
A small accessory with a specific fit
For an existing Aroma Tierra 100 ml glass bottle, matching the closure is the main reason to consider this accessory. Check the bottle first, then view the Glass Dropper for 100ml bottle at Fresh.