Save Money--- One packet of powder yields 250ml of calibration solution. The remaining unused pH calibration solution can be sealed storage for 15 days for future use
Save Time--- you can get 15 PACK at once: 5 packets 4.00 pH powder; 5 packets 7.00 pH powder; 5 packets 10.01 pH powder
Easy to Use--- Dissolve each packets with 250ml of distilled water
Widely Used--- Suitable for all pH meters with 4.00 7.00 10.01 calibration procedure
Attention--- Do not drink! Keep away from children! Sealed storage!