Salifert Alk Test Margin of Error

[A Toadstool Leather]

What is the margin of error for the low resolution test for the salifert alk test? I was wondering since I like to use it sometimes to save reagent

 

[JimWelsh]

Assuming that the margin of error is determined by the drop size, the syringe and plastic cone combo used by Salifert gives appx. 0.02 mL per drop, which corresponds to +/- 0.3 dKH at the normal resolution. At low resolution, that would be doubled, so it would be around 0.6 dKH.