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Hanna Gro Line Quick Cal Check Reservoirs & Water Temperature patios and walkways to prevent patios and walkways to prevent weed growthGreenhouse lighting aid: reflects 90% of light on the white sideFrost prevention on plantsGreenhouse winterizing cover Plug relay trigger cord set into 24 hour wall timer The HI5036 050 is for 500 mL of calibration solutionHermetically sealed to maintain freshnessOne solution for calibrating two parametersCalibration solution value is pH 6 allows for a single point calibration for pH and or conductivity sensors
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