BOJACK 15 Pack of pH Meter Buffer Solution Powder for Precise and Easy PH Calibration, PH Calibration Powder Solution 4.01pH,6.86pH and 9.18pH

• Easy to use: Mix the buffer powder with 250ML distilled water, put the pH meter into the solution, stir gently, and wait for a few seconds to get the result.
• Accuracy: The accuracy of the buffer at 25°C is within ±0.01 pH units, and it can remain stable for a long time. It is sealed in a durable moisture-proof individual packaging to keep it fresh until use.
• Does not contain BPA, does not contain any other harmful and toxic chemicals
• Package content: 15 packets of pH calibration package: 5*pH 4.01 solution powder, 5*pH 6.86 solution powder, 5*pH 9.18 solution powder, which can meet all pH requirements and is flexible in use.
• Wide range of applications: testing the pH balance of drinking water, aquariums, swimming pools, spas or hydroponics

Steps for usage Step 1: Open the package and pour the powder completely into a clean, dry glass container. Step 2: Add 250 ml of deionized water (or distilled water) to the container. (Preferably 250 ml calibration flask) Step 3: Stir until the powder is completely dissolved. Step 4: Calibrate your pH meter, put the pH meter into the solution, stir gently, and wait a few seconds. (Rinse the meter with pure water before testing) To ensure more accuracy, calibrate with 2 solutions, starting from 6.86, then 4.01 or 9.18. Specification: 5*4.01 solution (potassium hydrogen phthalate) 5*6.86 solution (mixed phosphate) 5*9.18 solution (borax) Note: It is not a drinkable solution, please keep it out of the reach of children aged 0-3!