How do i fix pH meter drift after calibration with buffer solutions?

[RobertL]

I’ve been trying to calibrate my home pH meter using the standard buffer solutions, but my readings keep drifting by about 0.2 pH units after a few minutes. I’m following the procedure exactly, letting the electrode stabilize in each solution, so I’m not sure if my meter is faulty or if I’m missing something in my technique.

[IsabellaJG]

Yeah I’ve been there. I had a drift of about 0.2 after a few minutes and I kept blaming the meter, but it turned out the buffer I was using was old and had absorbed CO2. I opened a fresh bottle, let it warm to room temp, and ran a quick check on a known neutral solution. The display settled much faster and stayed closer to the expected value through the test cycle. It wasn’t the meter’s fault, it was the reagents and temperature consistency, which sneaks up on you when you’re in a rush.

[TylerJW]

Another time I worried it was the electrode itself. Contamination or an aging reference can make it drift even after it seems stable. I rinsed the tip, checked the fill, and let the instrument sit longer at each point, but the drift stubbornly lingered until I noticed the room temp wasn't steady.

[Paul.S]

I swapped to fresh liquids and the drift dropped to almost nothing after the first calibration cycle.

[Gregory56]

Do you think the real issue is something else, like how you store the electrode between checks?