I had problems with my 5 year old Hanna PO4 photometer. Something was wrong with the ZERO button. The button itself worked but it does not accepted my input. I send the instrument back to Hanna for repair, received it back after 2 weeks and it was working well. Now some tests later the same problem showed up. I have send it back again and today I received a brand new instrument for free.
This is what I call customer service. Bravo Hanna !
G.Alexander


G.Alexander
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