Feature:1. This calibration buffer powder for PH meter is Individual sized PH buffer packets that can be tucked in drawer, bag or suitcase for travel.2. Easy to use: open the packet mix the powder with 250ML distilled water.3. This buffer powder will work with any electronic pH Meter.4. Individually wrapped to maintain freshness until use.5. Produced with premium quality material under strict conditions, pre-measured.6. These buffers are accurate to within ±0.01pH units at 25°C and remain stable over long periods of time.Specification: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.Features:This calibration buffer powder for PH meter is Individual sized PH buffer packets that can be tucked in drawer, bag or suitcase for travel.Easy to use: open the packet mix the powder with 250ML distilled water.This buffer powder will work with any electronic pH Meter.Individually wrapped to maintain freshness until use.Produced with premium quality material under strict conditions, pre-measured.These buffers are accurate to within ±0.01pH units at 25°C and remain stable over long periods of time.Specifications:Type: Set A, Set B (optional)Accuracy: ±0.01PH at 25°CPH buffer powder: 4.01, 6.86, 9.184.01: Often used under acidic conditions, 4.01 standard solution should be calibrated6.86: Often used under neutral conditions, 6.86 standard solution should be calibrated9.18: Often used under alkaline conditions, 9.18 standard solution should be calibratedItem weight: 2.7g / 0.1ouncePackage size: 60 * 50 * 10mm / 2.4 * 2.0 * 0.4inPackage weight:Set A: 22g / 0.8ounceSet B: 46g / 1.6ounceDirections 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 Powder2 * 6.86 PH Buffer Powder2 * 9.18 PH Buffer PowderSet B:5 * 4.01 PH Buffer Powder5 * 6.86 PH Buffer Powder5 * 9.18 PH Buffer PowderPackage List:Set A:2 * 4.01 PH Buffer Powder2 * 6.86 PH Buffer Powder2 * 9.18 PH Buffer PowderSet B:5 * 4.01 PH Buffer Powder5 * 6.86 PH Buffer Powder5 * 9.18 PH Buffer Powder