calibrate to 7

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Package Includes

The first Magnesium test of its kind for saltwater aquariums

41 mS/cm) TDS Range 0 to 3000 ppm (500 CF)

Hanna HI981074 Pool pH Tester | Waterproof | 0.1 Resolution | Auto Calibration magnesium meter calibrate to 7Waterproof, floating pH tester designed specifically for swimming pools, hot tubs, and spas. The Hanna HI981074 Pool Line pH Tester delivers professional accuracy with 0. 1 pH resolution and 0. 1 pH accuracy, featuring automatic temperature compensation, simultaneous pH and temperature display, and a waterproof design that floatsmaking poolside testing safe, easy, and reliable. Key Features & Benefits Waterproof & floats IP67 rated, designed to float