These are little electronic gadgets with a probe. You stick the probe in your liquid, press a button, and bam—a digital number. So satisfying. You get exact readings down to two decimal places.
But here’s the catch: they need calibration. That means you dunk them in special solutions first. Skip that step, and your meter will lie to you. A pH of 7 could show up as 9. Your tomato plants will know.
Quirky fact: expensive lab meters cost thousands. The cheap ones at home stores? They vibrate if you drop them in the sink. True story.
