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Hanna PH Calibration Solution pH meters should be calibrated frequently (every 1-4 weeks, depending on use) to ensure maximum nutrient availability to your plants. HANNA buffer solutions are prepared according to precise formulas and are standardized with a pH meter calibrated according to the NIST standards. This buffer value is widely used in water purification plants and in the food industry. Two-point calibration (using both 4.0 & 7.0 buffers) ensures the most accurate calibration possible. Do not reuse calibration solution, as once it has been used, it is no longer sterile and may result in improper readings. Pour a small amount into a shot glass and discard after use. Suitable for all makes and models of pH pens and meters. Product ID: XPHCALIBRATEX Category: pH and Nutrient-pH Adjusting Choose Your 4.01 pH Calibration Qty None Individual Packet $1.20 Case of 25 Packets $26.36 Choose Your 7.01 pH Calibration Qty None Individual Packet $1.20 Case of 25 Packets $26.36 Quantity

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