This PH buffer powder and buffer solution is a simple and easy solution to calibrating your electronic pH meter. This solution is compatible with most meters, and frequent calibration will help to ensure the accuracy of your PH readings. Perfect for testing PH balance of drinking water, pool, aquarium, Spa, or hydroponics. This buffer powder will work with any electronic PH Meter.

Specifications:
Type: Set A, Set B (optional)
Accuracy: ±0.01PH at 25°C
PH buffer powder: 4.01, 6.86, 9.18
4.01: Often used under acidic conditions, 4.01 standard solution should be calibrated
6.86: Often used under neutral conditions, 6.86 standard solution should be calibrated
9.18: Often used under alkaline conditions, 9.18 standard solution should be calibrated
Item weight: 2.7g / 0.1ounce
Package size: 60 * 50 * 10mm / 2.4 * 2.0 * 0.4in
Package weight:
Set A: 22g / 0.8ounce
Set B: 46g / 1.6ounce

Directions for Use:
Step 1: Open the packet pour the powder into a cleaning dried cup.
Step 2: Add 250ml deionized water (or distilled water) to the cup. (or a 250 ml calibrated flask)
Step 3: Stir until the powder has completely dissolved.
Step 4: Calibrate your PH meter. (rinse the meter by pure water before test)

Notes:
1.To ensure more accurate , calibrate by 2 solution, first use 6.86, then 4.01 or 9.18.
2.Cup should be or ceramic, don't use metal material.
3.You can store the calibration solution in covered jars or cup for 2-3 weeks. (In the refrigerated condition)

Packing List:
Set A:
2 * 4.01 PH Buffer Powder
2 * 6.86 PH Buffer Powder
2 * 9.18 PH Buffer Powder

Set B:
5 * 4.01 PH Buffer Powder
5 * 6.86 PH Buffer Powder
5 * 9.18 PH Buffer Powder