I have an opportunity to buy a few used Hanna testers. http://www.marinedepot.com/Hanna_In...ums-Hanna_Instruments-HN1181-FITEMOID-vi.html Phosphate, Calcium, Iron. Along with 12-24 powder packets for each and a different digital Hanna PH dip tester.
How good/accurate are these little checker testers? Asking price is $125 I might be able to get him down to $100.
How good/accurate are these little checker testers? Asking price is $125 I might be able to get him down to $100.