A pH meter is an electronic tool used to measure how acidic or basic a liquid is on a scale from 0 to 14.  It works by reading the voltage of hydrogen ions in a solution using a specialized probe and shows the number on a digital screen.
How It Works and Main Parts
  • Glass Probe: The delicate tip that touches the liquid and senses ion changes.
  • Reference Electrode: Provides a stable baseline voltage for comparison.
  • Voltmeter: Converts the electrical difference into a readable pH number.
  • Scale: 7 is neutral, below 7 is acidic, and above 7 is basic (alkaline).
Common Uses
  • Agriculture & Hydroponics: Checking soil water runoff or nutrient solutions for plant health.
  • Water Treatment: Monitoring drinking water safety or wastewater.
  • Food & Drink: Testing ferments, cheese, beer, or soil-less food production.
  • Laboratories: Running exact chemical and biological tests.
Care and Use Tips

  • Calibrate Regularly: Use standard buffer solutions (usually pH 4, 7, and 10) to keep readings exact.
  • Keep It Wet: Never let the glass bulb dry out; store it in the proper storage solution.
  • Rinse Gently: Wash the tip with pure distilled water between tests without rubbing the glass.