Frienda 16pcs Glass Pipettes Dropper with Rubber Cap Stir Rod Washing Brush | 6 Different Size Dropper, with Rubber Tops, 2 Stir Rod and 2 Brush, Graduated Markings for Essential Oil Transfer & Lab Use

To be honest I will rarely use them but sometimes I need to know something or do something simple. It makes a nice home lab set up and fairly cheap. As far as I would go is a minor in Chem. Majoring in Physics so there are times I need to see a measurement or am just curious about something I read of or learned to reinforce learning. I have a req. of at least one Chem course. Doing 6 gets me a minor but eats up a couple yrs. I haven't decided. Obviously these are not Lab Grade but fairly good and you can be very accurate and do sig. fig. with them and all that NOTE: they are not marked for tolerance.

Quality glass and rubber

Not too happy with suction.

Great

Útil

Everything arrived intact and it's all held up after constant use. I most commonly use the 10ml pipette and the labeling has been exposed to a myriad of compounds and it's still on the glass good. The rubber suction balls are a pain and I got a syringe pipette tool which has worked wonderfully with these. The labeling seems accurate on mine, but I only bought these once so I have no idea what batch consistency is like; mine were great though.

Good

None of the rubber pumps that came with them are right. I think the 10 ml one is the only one that is close. They sent 10 ml pumps for the 5ml pipettes which male it really touchy to suck up the right amount of nutrients and easy to fill too much into the pump. All the red ones are extremely flimsy and barely fit enough to create a vacuum, and obviously make it impossible to measure quickly and accurately. Ive bought other pipettes on amazon in the past in the same price range and they worked great. These ones not so much unfortunately. Ill probably buy better quality ones and keep the glass from this order and just swap pumps when needed