Hanna Alk Checker Accuracy

[surlytx]

The documentation states: Accuracy ±0.3 dKH ±5% of reading.

I'm not entirely sure what information Hanna is trying to impart with 2 different values for accuracy.

Hopefully, someone can clear it up for me.

 

[nereefpat]

Those two things add up, if that makes sense.

For example:
If the checker says 7.0, that means the value is 7 +/- 0.3 +/-5% of 7.
Or 7 +/- 0.3 +/- 0.35.
Or somewhere between 6.35 and 7.65 dKH.

 

[surlytx]

Those two things add up, if that makes sense.

For example:
If the checker says 7.0, that means the value is 7 +/- 0.3 +/-5% of 7.
Or 7 +/- 0.3 +/- 0.35.
Or somewhere between 6.35 and 7.65 dKH.

Thanks! I never considered it being additive.

 

[Miami Reef]

Those two things add up, if that makes sense.

For example:
If the checker says 7.0, that means the value is 7 +/- 0.3 +/-5% of 7.
Or 7 +/- 0.3 +/- 0.35.
Or somewhere between 6.35 and 7.65 dKH.

Wouldn’t it be between 6.75dkh to 7.35dkh?

 

[nereefpat]

Wouldn’t it be between 6.75dkh to 7.35dkh?

The 0.35 would be +/-3%.

The way I read it, it's +/-3% and +/- 0.3, so +/- 0.65

 

[ZoWhat]

Do NOT sweat accuracy... but consistently use the same test and react to SWINGS (deltas)

Stick with Salifert, Rea Sea or Hanna fir a year or two. Mixing mfrgs will drive you nutz

 

[Miami Reef]

The 0.35 would be +/-3%.

The way I read it, it's +/-3% and +/- 0.3, so +/- 0.65

How I understood it was either +/- 0.3 or +/- 5% of reading.

So is alk is 7dkh, a range from 6.7dkh to 7.3dkh is in the claimed accuracy.

Or if you want to do percentages, then 7dkh +/-5% is 6.65 to 7.35.

This was your quoted post from above which I think was a typo :

Or somewhere between 6.35 and 7.65 dKH.

 

[radfly]

Gonna sell mine, the reagent is just too flaky. I have one bottle opened two weeks ago reading 7.3, and one I just opened reading 9.3

Salifert is 8.3

Goes down as one of the more expensive piece of crud purchases I have made for my reef.

 

[lost66]

I have one bottle opened two weeks ago reading 7.3, and one I just opened reading 9.3

I have exact the same experience. I also noticed when I am about 50% of the bottle the color of reagent changes and some gunk forms in the bottle and it get into the sample vial.
I finally got trident and I am happy with those tests.