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The Bluelab pH Meter is a simple reliable pH meter that provides accurate readings and unparalleled ease-of-use. Growers can use this AAA battery-powered portable meter anytime anywhere with its simple push-button pH calibration. Its auto-off function extends battery life and its large display makes it a breeze to read. Includes double-junction pH probe pH calibration solutions two AAA batteries and a five-year manufacturer's guarantee on the meter six months on the probe.