How to Calibrate your pH Meter in Three Simple Steps

Sir, Do we need to calibrate before on each sample test..?

Leave it in each solution for 30 seconds before holding button for 5 seconds so the reading settles. Then LEAVE it in solution after it starts flashing until it stops flashing. Make sure you weigh the 250ml of water to exactly 250 grams because a little more or less strongly affects the ph. Temp should be as close as u can but its not as critical, 5C only changes PH 0.02 apparently.

If you only need accuracy of 0.1 PH u probably dont have to calibrate it at all when new. Keep probe tip wet with distilled water. If it dries out soak in distilled water for hours.

Are you rinsing with tap or distilled

Why these buffer sache are used for?

Your supposed to wait until 60 seconds have passed with no change in ph before calibrating .
Your also supposed to wait until the screen stops flashing before removing from the solution.