
Buffer solutions do not have the correct pH to calibrate pH meters. Buffers 4 and 7 work moderately, but not very accurately. They differ by about 0.14. A pH 10 buffer is far from ideal. About 0.30. It's so far away that my pH meters don't pick it up. After spending a little more and buying genuine branded buffers, both of my pH meters are properly calibrated. I won't buy this again.

Get Your All-Purpose Cleaning Solution With Bealee'S 24 Oz Plastic Spray Bottles - 2 Pack
16 Review

ULAB Scientific 1000Ml Borosilicate Glass Beaker With Printed Graduation - Durable And Accurate For Lab Use (UBG1005)
12 Review

2-Pack 32Oz All-Purpose Heavy Duty Plastic Spray Bottles - Leak Proof, Adjustable Nozzle For Cleaning, Planting & Pet Care - Green
22 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