Buffer - Powder for calibration of PH4.01, PH6.86, PH9.18 Water Testers. The contents of the sachet should be dissolved in 250 ml of demineralized water at a temperature of 25C. After the powder is completely dissolved, the meter can be calibrated. The water quality tester is a device designed to test the purity of water. It measures the total amount of all dissolved substances in water (PPM), conductivity (µS) and temperature (° C). 0-170 PPM water is perfect for consumption. Water 170-500 PPM is medium quality water. Water of 500 PPM and more is polluted water. The water quality meter is easy and convenient to use with a very wide range of applications useful in: * aquaristics, * pharmacy, * cosmetic plants, * medical, * analytical laboratories, * home. It can be used to evaluate water quality in a tap, aquarium, swimming pool, river. Included Water Tester Calibration Powder: PH4.01 - 1 sachet PH6.86 - 1 sachet PH9.18 - 1 sachet https://elecena.pl/product/22623492/buffer-powder-to-calibrate-water-ph-tester-meter-ph4-01-ph6-86-ph9-18 2023-02-23 https://elecena.pl/product/22623492/buffer-powder-to-calibrate-water-ph-tester-meter-ph4-01-ph6-86-ph9-18 2024-03-11 https://elecena.pl/product/22623492/buffer-powder-to-calibrate-water-ph-tester-meter-ph4-01-ph6-86-ph9-18 2025-06-09 https://elecena.pl/product/22623492/buffer-powder-to-calibrate-water-ph-tester-meter-ph4-01-ph6-86-ph9-18 2025-10-26 https://elecena.pl/product/22623492/buffer-powder-to-calibrate-water-ph-tester-meter-ph4-01-ph6-86-ph9-18 2025-10-28