I have been using API test kits since I began my first reef 4 yrs ago. I trust the API for yrs. I recently bought a red sea pro test kit. Well I did a alk test last night and the red sea read alk at 9.8 dkh....Well I decided to test with the API and see how far off it is well it read alk at 7 dkh... I don't know which to trust far as which is correct...need a little help on this matter plz an than you..
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