Ronyes Lifescience Thick Glass Graduated Measuring Cylinder Set - 5ml 10ml 50ml 100ml with Two Brushes

I use these for measuring out dyes. They wash perfectly clean and don't stain. Also, I have kept the box because each piece has a molded section to return when finished, keeping them safe.

Nice packaging, thick glass, better than advertised accuracy, includes brushes.That being said, I don't want to suggest that these are the equal of a well recognized brand's "Class A" cylinders costing several (maybe 10?) times as much. I can't make a comparison with a "nice" cylinder, but I would expect that a name brand product would have better QC. The markings on my set are less sharp and crisp on some cylinders than others. This is not glaringly obvious, but it reveals the manufacturing conditions required to meet the very reasonable price point. Aside from that though, I took multiple measurements with each cylinder, checking the mass of distilled water at 20C to 5 significant figures on calibrated equipment and found mine accurate to within about half of the indicated error or better. The precision was even better, suggesting that the markings are well matched to precisely made tubes. My 100mL delivers about 0.45mL+/-0.2mL more than indicated. The 50mL and 10mL give consistently about -0.2mL and -0.1mL respectively. That's pretty good I think. If I needed more accuracy I think I would go by mass instead of volume anyway.One note, these are marked EX (same as TD). These markings mean that the measured amount will be delivered when poured out, not that the cylinder contains the measured amount. The little bit left after pouring is supposed to be take into consideration, which is what you want for this type of cylinder.

Amazing for using it for essential oils and when requiring precise measurements. So grateful for this kit! Thank you!Delivery went smooth and arrived promptly. Also well packaged and arrived in perfect condition.

Very good quality lab equipment.

Thick glass. Comes in protective plastic molded tray. Value for money compared to the purpose made plastic bottles and kits to measure ethanol content. Other uses as well. Such as measuring liquid fertilizers and weed treatments, 2 stroke oil ratios. Having a Prime membership was a bonus as it arrived same day.