Complete rubbish, don't waste your money. I used them to calibrate my new brewing pH meter and spent two weeks trying to figure out why my pH levels were about 0.4 lower than my software predicted. I narrowed it down to my pH meter, so I recalibrated my meter with Milwaukee calibration solutions and then tested the pH of these buffers, 4.32 for pH 4, 7.22 for pH 7. Bullshit! So I kicked her out last night. . Listen to other reviewers who said it's far, buy something else!
Graduated Erlenmeyer Glass Flask Set With Narrow Mouth - 500Ml Capacity
15 Review
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
ULAB Scientific 1000Ml Borosilicate Glass Beaker With Printed Graduation - Durable And Accurate For Lab Use (UBG1005)
12 Review
Valchoose LDPE Economy Wash Bottle, Narrow Mouth Squeeze Bottle Medical Lab Plastic, Safety Squeeze Bottle No Spill, Bend Mouth Watering Cans (500Ml / 16Oz / 1 Bottle)
14 Review