6 in 1 pH H2 Meter with pH EC Calibration Solution, with Extra Electrode Cleaning Solution for Drinking Water, Hydroponic, Aquarium, Well Water Packing List: 6 in 1 pH H2 meter with pH 4.0 7.0 Solution &1413μS/cm calibration solution; with 50ml pH 4.0 7.0 Solution, 50ml pH Electrode Cleaning Solution and 50ml 1413μS/cm calibration solution Hydrogen Water Meter PPB PPM: The newly launched EZTOCH hydrogen water bottle tester in 2025, can switch between two modes of H2 test (PPM/PPB) with one button. PPM measurement range is 0-2400ppm with resolution of 2ppm. PPB measurement range is 0.001-2.400ppm with resolution of 0.002ppm. High-precision measurement, fast response, suitable for hydrogen producing water bottles, hydrogen generators, hydrogen-enriched water, H2 water generator Widely Used Drinking Water Tester: EZTOCH pool pH tester has a wide measurement range, including pH (0.1-14.0), H2 (0-2400ppb/0.001-2.400ppm) EC (0-9999μS/cm, 10.1-19.9mS/cm), TDS (0-9990ppm), ORP (-999mV-+999mV), and temperature (32.0-122.0℉). EZTOCH aquarium pH tds meter has accurate measurement and wide measurement range, suitable for hydrogen generators, hydroponics, aquariums, swimming pools, drinking water, kombucha, beverages, coffee, brewing, ponds, hot tubs Precise & Reliable pH Calibration Solution: Ensure accurate pH measurements every time with EZTOCH premium pH buffer solutions. This calibration solution kit includes precisely formulated pH 4.00, 7.00 calibration fluids for reliable calibration of your pH meter across its entire measurement range, Using high-precision, high-stability standard solutions ensures your pH meter is always in proper condition, providing accurate, reliable pH readings Designed for accurate calibration of pH meters/acidity meters. The kit includes 50ml (1.69 fl oz) of pH 4.00 and 7.00 standard buffer calibration solutions for acidic and neutral measurement points; a 50ml bottle of dedicated pH electrode cleaning solution for cleaning the pH meter; and a 50ml bottle of EC 1413μS/cm calibration solution for calibrate ec/conductivity meter