Types of pH meters
In general there are three major categories of pH meters. Benchtop pH meters are often used in laboratories and are used to degree samples which are brought to the pH meter for analysis. Portable, or field pH meters, are handheld pH meters that are used to take the pH of a sample in a field or production site. In-line or in situ pH meters, also called pH analyzers, are used to degree pH continuously in a process, and can stand-alone, or be connected to a higher level information system for process control.
pH meters range from simple and inexpensive pen-like devices to complex and expensive laboratory instruments with data processor interfaces and several inputs for indicator and temperature measurements to be entered to vary for the variation in pH caused by temperature. The output can be digital or analog, and the devices can be battery-powered or rely on line power. Some list of paraphrases use telemetry to connect the electrodes to the voltmeter display device.: 197–215
Specialty meters and probes are available for usage in special applications, such(a) as harsh settings and biological microenvironments. There are also holographic pH sensors, which permit pH measurement colorimetrically, devloping use of the nature of pH indicators that are available. Additionally, there are commercially usable pH meters based on solid state electrodes, rather than conventional glass electrodes.