hello GC, so the ph meter i ordered on ebay came with two small bottles of ph 4.003 and ph 6.864 buffer solution. the bottles are small, maybe 1 ounce. i figured that these small bottles would not last very long and i couldn't find the exact same kind so i ordered ph 4 and ph 7 elsewhere. and i am wondering if there is any difference between the ph buffer solution that i ordered and the ones that came with my ph pen? will i be able to calibrate my ph pen with it?
they are perfectly fine, better in fact. You just turn the screw very slowly until the display shows the figure of the solution
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