Nynelly 15pcs pH Meter Buffer Solution Powder for Precise and Easy for Precise pH Calibration Powder Solution?4.01pH,6.86pH and 9.18pH

Nynelly Powder buffer solution provide long shelf life and stability and are ideal for low volume use. It provides long shelf life and stability, ideal for low volume use. It's lightweight, inexpensive and takes up very little space. Specification and Package including Each Pack Volume: 250 ml. Each powder packet/sachet makes 250ml of solution (when mixed with distilled or deionized water) Accuracy: ±0.01pH at 77°F(25°C) Step to use: Step 1: Open the packet pour the powder into a cleaning dry glass container. Step 2: Add 250ml deionized water (or distilled water) to the container.(better 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) Note: 1. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2. To ensure more accurate , calibrate by 2 solution, start at 6.86, then 4.01 or 9.18. 3. Container should be glass or ceramic, don’t use metal material. 4. you can store the calibration liquid in covered jars or containers for 2-3 weeks. Your pH meter is not so accurate anymore? If you have a pool, aquarium, or spa, pH testing is something you do on a regular basis. However, hassling with messy liquid solutions may not give you the accuracy you need. Put the measuring cup away and opt for pre-measured convenience. CAUTION: Not a drinkable solution!