These are just about perfect 4 ounce dropper bottles. I evaluate items by imagining the perfect item of that sort, then I inspect and evaluate the real item and subtract points for every shortcoming and defect in design and execution. Just a few points subtracted? Five stars. Lots of points taken off, but the article is still useful? 3 stars. You get the idea.I couldn't find any shortcomings to these bottles, so no points taken off. A perfect score! They arrived packaged very securely in their box, with a strip of foam wrapped around each bottle. I tested for leakage by filling a bottle with water and turning it upside-down for several hours. No leakage whatsoever. I determined how completely the dropper could remove the last bit of liquid from the bottle. Very impressive, with the dropper being able to access all but 2 or 3 drops of liquid at the very bottom of the bottle. The dropper is very well done, being graduated in 0.25 ml increments up to 1.0 ml. It also has a capillary tip for precise dispensing, a very nice touch. These are absolutely solid 5 star dropper bottles.
Laboy Glass 500ML Single Neck Round Bottom Boiling Flask Heavy Wall With 24/40 Joint Heating Reaction Receiving Flask Organic Chemistry Lab Glassware
16 Review
Graduated Erlenmeyer Glass Flask Set With Narrow Mouth - 500Ml Capacity
15 Review
3Pcs 500Ml CVNDKN Wash Bottles W/ Scale -16 Oz: Plastic Safety Lab Squeeze Bottle
13 Review
ULAB Scientific 1000Ml Borosilicate Glass Beaker With Printed Graduation - Durable And Accurate For Lab Use (UBG1005)
12 Review