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Accuracy: ±0.01pH at 77°F(25°C)
✔ 6 packets of pH 4.01 Solution powder
✔ 6 packets of pH 6.86 Solution powder
✔ 6 packets of pH 9.18 Solution powder
Directions for use:
Step 1:Completely empty the powder into a dry glass container.
Step 2:Add 250mL deionized water (or distilled water) to the beaker.
Step 3:Stir until the powder has completely dissolved.
Step 4:Put the pH meter in the solution and gently stir and wait a few seconds for the result.
CAUTION: Not a drinkable solution!
NicFle
Reviewed in the United States on June 10, 2024
On multiple occasions now when I use them, my top shelf pH meters read different then what advertised.....Next purchase won't be this brand or store
CJS
Reviewed in the United States on March 22, 2023
IMHO, not worth the effort to return and reorder. Quality control???
Adam
Reviewed in the United States on March 1, 2023
Easy to use and accurate
Clifford Stuckey
Reviewed in the United States on September 15, 2022
Great for recalibrating my ph pen.
Bill Head
Reviewed in the United States on October 14, 2022
If you use the cheaper model pH test pens these are a must.Having to have fresh distilled water in hand that hasn't been opened is kind of a pain but is a necessary evil for proper calibration.
Harpo.
Reviewed in the United States on June 29, 2021
Works as advertised. Easy to use. Just need distilled water and follow instructions and calibrate your pH meter per instructions Can keep standard for about a week, then mix new.
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