[Convenience use] 5 seconds know the water quality, accuracy, faster. This Combo set of TDS PH EC Temperature. Besides, it has best price, reliable quality, all make it your first water quality test. [durable model] PH Pen have AUTO CALIBRATION function, no need to any type of screwdriver to calibrate the pH tester pen. TDS pen have Lock & auto shut off function. [Pocket Portable] Small size but suitable for testing pH balance of drinking water, swimming pool, aquarium, reverse osmosis system, spa , or hydroponics. [Wide Application] Ideal for home and laboratory pH testing, including drinking water, electroplating liquid, boiler water, water in aquarium, swimming pool water, photographic rinsing fluid, well water, deep ground water, aquaculture, food processing and more.
