HANNA - GroLine Waterproof Hydroponic pH Tester (HI98118) + Free Calibration Certificate

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    The HI98118 GroLine pocket pH Tester is an affordable way to measure the pH of hydroponic nutrient solutions. The maintaining of an optimal pH is essential to maximize optimum growth. The general rule of thumb is that as pH increases the solubility of minerals and nutrients decrease. It is important that nutrients are soluble for plants to uptake and use for growth. The pH of nutrient solution can also affect the bacteria that fix nitrogen for the plant to use. Every plant has optimum pH levels for growth. Below is a table for the ideal pH range for a variety of plants.

    The HI98118 can be used to measure the pH in soils as well as nutrient solutions.


    pH Range 0.00 to 14.00 pH
    pH Resolution 0.01 pH; 0.1°C
    pH Accuracy ±0.1 pH
    Accuracy ±0.1 pH / ±0.5 °C
    pH Calibration automatic, at one or two points using standard buffers (pH 4.01, 7.01,10.01); one point calibration using quick calibration solution
    Temperature Compensation automatic from 0 to 50°C (32 to 122°F)
    Battery Type/Life 1.5V CR2032 (1) / approximately 1000 hours of continuous use
    Environment 0 to 50°C (32 to 122°F); RH max 100%
    Dimensions 160 x 40 x 17 mm (6.3 x 1.6 x 0.7“)
    Weight 75 g (2.6 oz.)


    Key Features 

    • Built in temperature sensor for Automatic Temperature Compensated measurements.
    • Renewable junction to clear any clogging that causes readings to drift and be erratic .
    • Stability indicator that disappears once a stable reading is obtained .
    • Automatic calibration to one or two points at a push of a button.
    • Uses Hanna's Quick Cal pH/EC standard with a pH value of 6.86. The standard can also be used to calibrate conductivity meters to 5,000 μS/cm .
    • Battery % level remaining displayed at start up.
    • Low battery indicator that is displayed when less than 10% battery life is remaining.


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