+1I had issues with mine until I tried:
Cleaning the beaker with microfibre at each stage.
Inserting with the hanna 10ml facing forward each time.
it is v sensitive to micro bubbles and marks on the container.
10ml of seawater is 10.26 gramsI use 0.01g scales from Amazon, cheap to buy, seems a bit extreme but after reading someone had an issue with the line being in the wrong place, I tried a syringe but that too wasn't very accurate either as the margins we are talking here are so small, I already had the scale for making a salinity solution so ended up using the scale, works great, trying to get the exact amount in the vial each time by eye isn't easy.
Yes 10ml is 10g.
I had read a few times of people storing their vials with rodi water, but to me that seemed pointless unless you also took care of the glass on the outside too so yes I also store the vial in a little tub of rodi water, the lid is ceramic or similar so is fine in the water.
I’m thinking I’m going to have to buy the reference fluid although I’ve got a new pack of Reagents and new vials I’ll run two or three tests tomorrow See if I get any consistent results then I’ve covered every variable i possibly can. If all fails reference fluid and hopefully a new checker from Hanna if it is indeed an defective checker considering the amount I’ve spent with them.
Good point 10g would be H2O only. There is more just salt in there so scale option is out of the window
I had the same issue with Hanna Alk checker. It would read +- 1 dkh depending on the vial I use. I ended up sticking to a single vial and the issue seems to have been resolved.
Ok it’s is overstatement but if you don’t know what is in the water (since you want to measure it) than you don’t know it’s weight either. I guess it also doesn’t matter because our test kit is not accurate.Why is a scale option out the window? If you have a good scale, mass measurement is often more accurate than volume measurement, and we know the density of seawater at any given salinity.
That said, aquarium water volume measurements are not causing more than a tiny change in phosphate readings.
Ok it’s is overstatement but if you don’t know what is in the water (since you want to measure it) than you don’t know it’s weight either. I guess it also doesn’t matter because our test kit is not accurate.
my thinking is since there are no accurate weight than we have to get back to volume and if we really want to we can use a standard fluid to set it and than use that volume as a standard. But this is what Hanna has done for us already so why not just use that.
To be fair it doesn’t matter if the reading is incorrect and let’s say it is 1 instead of 1.01.
all we need to know that it is less ore more in tendencies so we can get a picture of what is going on.
That is exactly my point. You only know it by guessing the content. In theory (because I am too lazy to do all the maths) the same volume of aquarium water mixed from different salts weights different as the amount of dry material is different in the water.If you know the salinity (or specific gravity), then we know the volume exactly (by mass). There's no uncertainty there (except by how well you measure mass and salinity).