A pH meter is an instrument used to measure the acidity or alkalinity of a solution, expressed as pH. It measures the hydrogen-ion activity in water- based solutions, indicating their acidity or alkalinity. The pH value is a measure that describes the degree of acidity or alkalinity on a scale of 0 to 14, with 7 being neutral, values less than 7 indicating acidity, and values greater than 7 indicating alkalinity. The instrument is widely used in various industries such as food and beverage, pharmaceutical, oil and gas, agriculture, and water treatment plants. A pH meter typically consists of a voltmeter attached to a pH-responsive electrode and a reference electrode, with the glass electrode developing an electric potential directly related to the hydrogen ion activity. The instrument is essential for obtaining accurate pH measurements in various applications, ranging from laboratory to industrial settings

. For more information, you can watch a video demonstrating the proper use of a stationary pH meter on the Bio-Rad Explorer's YouTube channel