How can i measure pH of my homemade vinegar with a pH probe and multimeter?

[RobertS]

I’m trying to measure the exact pH of a homemade vinegar I made from apple scraps, but my cheap litmus paper just shows a vague orange color. I’ve read about using a multimeter with a pH probe for more precise readings, but I’m not sure if my basic electronics skills are enough to set up a reliable measurement circuit at home.

[Addison41]

I did something similar a while back. the litmus was never precise and the color looked muddy on apple scrap vinegar. I finally bought a basic digital meter with a glass probe and calibrated it with two buffers. the readings for that batch hovered around the low 3s and drifted with temperature. it felt more reliable than chasing an orange patch in bright kitchen light.

[Charles97]

A plain multimeter won't read that kind of sensor properly. the probe needs a very high input impedance, plus calibration, temperature compensation, and a stable reference. I tried wiring a probe to an Arduino ADC once and the numbers danced until I added buffering and a stable reference, but it still felt fiddly. if you want reliable numbers, a dedicated meter is hands down easier.

[SophiaL]

Have you checked whether the problem is really measurement or something else? old litmus paper can be the culprit, or the color interpretation under kitchen lighting. maybe your sample isn’t uniform, or the scraps left more sugar or pigment that throws off color. mixing, letting it settle, and sampling from the middle might help you see what’s happening.

[Larry.L]

Sometimes I drift into other threads while waiting for a reading—like wondering if the bottle, residue, or temperature is the real limiter. I once forgot to rinse the probe and got odd results; after rinsing and letting it sit at room temperature, the numbers steadied a bit, but I’m not sure I’d trust them as a lab result.