Question about Hannah checkers

[FragIt Dan]

PO4 is good, Ca can be good but the syringe they give you to add 0.1ml of tank water is, IMO, not accurate enough. I carefully did several tests in a row on the same water and had readings fluctuating by 40-60ppm. I eventually got a very accurate glass pipette and am getting much more accurate readings. As already mentioned, you need to use very clean RODI water as part of the test, but you can verify it is Ca free by running a test without adding any tank water and dividing the test result by 100; ie if you do this and get a result of 200, your RODI water has 2ppm Ca in it. You should/will need to get a reading of 0, indicating a result of 0.00ppm, if it is flashing 600 then you have more than 6ppm Ca in your RODI water. If you don't have access to good RODI water, go get a 4l jug of distilled water from a pharmacy (~$3) and run a test on it to make sure it's ok.
Dan

[monocus]

i have the phos,alk,cal,nit,and iodine and have never had any problems with them;and yes you really have to read the directions on the calcium

[jesse1884]

i just bought a good ro/di system from my LFS that has a tds meter built in it are those always accurate do you know?

[jesse1884]

and to think i got the hannah checker because i thought other calcium test kits were a pian

[martinmcnally]

Funny I was just testing my Calcium a few minutes ago with a Hanna checker. It read 551. Fail haha! Last reading was 490 and I haven't done any water changes or added calcium.

IMO the power packet is dumb and a mess. Also adding droplets is way easier and very accurate compared to syringes. They did get the reader right however they have a long way to go on everything else.

[kien]

I started with the PO4 and love it. Then got the Alk and love that one too. Then got the calc and despise it. It is in my opinion more of a pain than other standard (non digital) kits. I used the Hana calc checker once a year ago and it has been collecting dust ever since.

[subman]

I sold my ca and alk Hanna kits and went back to drops just found the readings more consistent. I'm using the red Sea pro kit now and love it

[Kevotron]

The Alk one is quite easy to do and recommended
but Ca is a nightmare... I can use the Elos 5 times before completing 1 Hanna test