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It's for 50 tests and there is a refill option. I purchased mine here...
https://www.bulkreefsupply.com/alkalinity-test-kit-lamotte.html

Not sure outside of U.S. maybe someone else knows if you...

I would also recommend the lamotte alkalinity test as a confirmation of the kh director readings. My hanna read .6 to 1 dkh higher, when I got the lamotte test it was actually a little lower than...