Hannah Alk: 12dkh Red Sea: 11dkh. Which one is more accurate?

[Miami Reef]

I did each test twice and each kit was consist with themselves. Which one should I believe?

 

[Ocean’s Piece]

I did each test twice and each kit was consist with themselves. Which one should I believe?

Hanna

 

[Fishingandreefing]

Hanna.

 

[Randy Holmes-Farley]

I did each test twice and each kit was consist with themselves. Which one should I believe?

Maybe its 11.5 dKH and both are equally accurate.