VERENIX 18 Pcs pH Meter Buffer Solution Powder, pH Buffer Calibration Solution Powder, pH Meter Calibration Packets for Precise and Easy use, 4.01pH, 6.86pH and 9.18pH

18 Packs Contents: 6*pH 4.01 solution powder, 6*pH 6.86 solution powder, 6*pH 9.18 solution powder, which can meet all pH requirements and is flexible in use.
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.
Works with Any PH Meter: This buffer powder will work with any electronic pH Meter. Ideal for Calibrating.
Wide Range of Applications: testing the pH balance of water, aquariums, swimming pools, spas or hydroponics.