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What is a pH tester?

PH is a measure of the relative amount of hydroxyl and free hydrogen molecules in a liquid. Liquids containing high levels of hydroxyl are considered basic or alkaline, while liquids containing higher levels of free hydrogen ions are considered acidic. Pure water at 25 degrees Celsius has a pH of 7.0 and is considered neutral. This means that it has an equal amount of hydroxyl atoms and free hydrogen atoms. All other measurements are based on the neutral standard 7.0. Acids and bases can be used to clash in a liquid until a neutral balance is reached. The pH scale ranges from 0.0 to 14.0. The lower the measurement, the more acidic the solution and the higher the measurement, the more alkaline the solution . A measurement of 6.0 would be considered slightly acidic, while a measurement of 2.0 would be considered extremely acidic. The best way to compare the acid in a solution is to determine "how often one liquid is as acidic" as another. The easiest way to do this is to use a logarithm. The pH scale is based on a logarithm which gives us a standard for the number of times an acid solution is compared to a neutral solution. Each 1 point step up means that a liquid is 10 times more alkaline, and each 1 point step down means that Temperature can also play a role in measuring pH. At warmer temperatures, a neutral pH will be less than 7.0. Indeed, the reaction ahead of the self-dissociation of water is favored endothermically and the rate of ionization of water increases at warmer temperatures. Increasing the ionization rate increases the concentration of hydrogen atoms, which lowers the pH level. This means that at 40 degrees Celsius, a neutral pH would be 6.77 instead of 7.0.

What are the usefulness of a pH Meter?

Whether it's the pH tester for plant growth or the maintenance of an aquarium, the optimal level can mean the difference between success and failure. In agricultural applications, pH testers will affect everything from root development and the availability of usable nutrients in a growing medium to preventing the growth of fungi and plant diseases. Although many plants can survive under various conditions and some plants may thrive in more acidic or more basic soils, the majority of plants prefer a neutral or slightly acidic growth medium. The ideal range for most plants is between 6.0 and 6.5. When the culture media are very acidic, manganese and aluminum can become toxic to a plant. At levels of 7.0 or higher, minerals like magnesium, phosphorus and calcium may become unavailable. Maintaining an appropriate pH range in aquariums can help your fish thrive. If you have a saltwater aquarium, slightly alkaline water from 8.1 to 8.4 can give your fish a natural antiseptic effect and help them resist bacteria and disease. It can also slow down the rate at which coral calcifies. Observing changes in the pH of your water can even give you a warning sign that your marine environment is undergoing other dangerous changes.

How does the pH Meter work?

There are three main methods for measuring the pH of a solution: the hydrogen paper method, the colorimetric method and the electrode method. The hydrogen paper method is based on a special type of test paper called litmus paper. Litmus paper is a simple filter paper that has been treated with a mixture of natural dyes derived from a variety of lichens. These dyes change color in response to exposure to acidic and basic solutions, usually red when exposed to acid and blue when exposed to a base. The hydrogen paper method is the oldest method of analyzing pH levels and sunflower was used as early as 1300 AD. Unfortunately, if he can tell us if a solution is acidic or basic, he does not give us an accurate numerical measurement. The colorimetric method is similar to the hydrogen paper method in that it uses the natural color change reaction of chemicals when exposed to acids and bases to determine pH levels. In this case, indicator reagents such as phenol red and bromthymol blue are used to produce the color. Instead of dipping a piece of paper in the solution and changing the color of the paper as with the hydrogen paper method, these indicator reagents are deposited in a small sample of the liquid to be measured, and the sample changes color. It is a little more precise than the hydrogen paper method because the color and intensity of the liquid can be compared to a color graph to obtain a digital pH level. Currently, the electrode method is the most common and most accurate method for measuring pH at home and in the laboratory. This method uses a probe and a measuring device, which must be calibrated before being used in a pH buffer solution. The measuring device measures tiny differences in voltage between a reference electrode and the measuring electrode, and then converts these measurements to a digital pH measurement.