Help with Hanna Checkers

[SaltwaterAq]

Hanna Copper Checkers IN STOCK! - https://www.saltwateraquarium.com/hanna-hi702-high-range-copper-checker-saltwater-hanna-instruments/

 

[sprouseod]

Alk, Cal and Ph

 

[Vincent100]

Just done 5 tests with my Hanna alkalinity checker ...ppm

Test 1 ,127 ppm ...7.1 dkh
Test 2 ,132 ppm ...7.3 dkh
Test 3 ,130 ppm ...7.2 dkh
Test 4 138 ppm ...7.7 dkh
Test 5 129 ppm ...7.2 dkh
So which one is it , the130 ppm and 129 ppm .

Hi755s reagent was opened a couple months ago ,exp 04 2019
I do the test exactly the same every time .
Think I'll be moving back to salifert :mad:

 

[nereefpat]

Just done 5 tests with my Hanna alkalinity checker ...ppm

Test 1 ,127 ppm ...7.1 dkh
Test 2 ,132 ppm ...7.3 dkh
Test 3 ,130 ppm ...7.2 dkh
Test 4 138 ppm ...7.7 dkh
Test 5 129 ppm ...7.2 dkh
So which one is it , the130 ppm and 129 ppm .

Hi755s reagent was opened a couple months ago ,exp 04 2019
I do the test exactly the same every time .
Think I'll be moving back to salifert :mad:

Are you serious?...almost exactly the same numbers...

 

[blkhwkz]

Just done 5 tests with my Hanna alkalinity checker ...ppm

Test 1 ,127 ppm ...7.1 dkh
Test 2 ,132 ppm ...7.3 dkh
Test 3 ,130 ppm ...7.2 dkh
Test 4 138 ppm ...7.7 dkh
Test 5 129 ppm ...7.2 dkh
So which one is it , the130 ppm and 129 ppm .

Hi755s reagent was opened a couple months ago ,exp 04 2019
I do the test exactly the same every time .
Think I'll be moving back to salifert :mad:

Accuracy @ 25°C/77°F ±5 ppm (mg/L) ±5% of reading

That is right off the Hanna website.

 

[HolisticBear]

Are you serious?...almost exactly the same numbers...

+1

Accuracy from their website: ±5 ppm (mg/L) ±5% of reading

You had one outlier, but 4 of the five looked good.

 

[manilaboy1vic]

i have the ALK and PHOSPHATE checker..

i dont know what to believe with the phosphate one.. i can do 3 dif. tests and get 3 dif. results..

my ALK is the ppm one and i got authentic viles from hanna to make sure the ALK is reading correctly..

this here:

https://www.bulkreefsupply.com/hi75...rds-for-hi755-hanna-checker-marine-water.html

you know you can trust the checker if you pass using these viles.