Product DescriptionProtect You u0026 Your Family’s HealthIdeal for Household or Laboratory Use, Suitable for Testing Ph Balance of Drinking Water, Pool, Aquarium, Ro System, Spa, or Hydroponics; Appropriate for Wide Range of Applications.Instructions for use of PH calibration powder:Calibration powder: pH standard solid substance. It can be used after adding water. Suitable for the calibration of any type of ph meter. Each package can prepare 250ML standard solution.(Be sure to add water according to the required ratio, otherwise it will affect the accuracy of the calibration and increase the error)Questions u0026 Answers:1. Q: How often should I calibrate my ph meter pen ?A: One calibration can last for about half a month. When the electrode exposed to air for extended period of time, users should calibrate it. When testing polluted water quality, more frequent calibration is required to ensure the accuracy of the test value2. Q: Can I test two kinds of water without calibrating ?A
