15Pcs PH Meter Buffer Solution Powder If you have a swimming pool, aquarium or spa, you will need to conduct a pH test regularly. However, troublesome liquid solutions may not provide you with the accuracy you need. Let go of the measuring cup and choose the convenience of pre-measurement. specification: 5 * 4.01 solution (potassium hydrogen phthalate) 5 * 6.86 solution (mixed phosphate) 5 * 9.18 solution (Borax) user's guidance: Step 1: Pour the powder completely into a clean 250mL glass beaker. Step 2: Add 250mL of deionized water (or distilled water) to the beaker. Step 3: Stir until the powder is completely dissolved. Step 4: Calibrate the pH meter according to the Esee pH meter calibration procedure (for Esee PH meter: B01LWMJVPG) Note: Not drinkable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia