Standard PH4.01 + PH6.86 + PH9.18 Powder

H Calibration Powder Bag Calibration Buffer Solution PH4.01 PH6.86 PH9.18
feature:
A bag of pH calibration powder is mixed with 250ML distilled water
The mixed pH solution is the standard buffer solution
Please complete the operation under normal operation, and the child shall complete the operation under the supervision of adults
Scientific blending can be used to calibrate PH meter
Each pack of PH calibration powder is about 2.8g
notes:
All dimensions are measured manually, so please allow a distance of 1-2cm.