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					Originally Posted by Davidbugera  The Manuel says to use a ph of 7.0 and 10.0 to calibrate I'm new to the apex so not sure if it would work but thank u for the reply | 
	
 Since the manual says that, you should follow it I guess. You can grab small packs of powders from LFS that you have to mix with specific amount of RO/DI water.