The pH value of chemical compounds is measured using pH meters. They are often used in laboratories. They can also be used to check the drinking water quality in buildings or at public water dispensers. People who keep fish can check the pH value of the water regularly to keep demanding fish and plants in appropriate conditions. Farmers and (landscape) gardeners can measure the quality of the soil, to manage it appropriately. Equipped with rechargeable batteries, sturdy and watertight, these devices can be used anywhere.