pH metar S40-KS Seven multi pH kit
pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading. The pH probe measures pH as the activity of hydrogen ions surrounding a thin-walled glass bulb at its tip. The probe produces a small voltage (about 0.06 volt per pH unit) that is measured and displayed as pH units by the meter. The meter circuit is fundamentally no more than a voltmeter that displays measurements in pH units instead of volts.