Shiny things!
I bought a couple of used checkers from a member on this site. I thought it would be fun to see what the hype is about. All I can say for sure is meh. I think I picked the wrong tests to play with.
First lesson learned. Do the math before buying used.
I got a great deal, two @ $65 shipped right ? - Well not as good as I thought

. The reagents were expired (and I knew) so I ordered reagents. So add reagents to the total. Ok it looks like I still saved a few bucks and instead of 35 tests I get 50. (A new phosphate tester comes with 10 tests and calcium comes with 25). I don't have cases so add that to the cost to get something to store them in. ok It is pretty much a wash now. The calcium tester is older and comes with a 1ml syringe instead of the 100uL pipette. If you wanted to buy that its an additional $20. ugg
Ok so that's
- Checkers - $65
- Reagents - $26 (adjusted price the Phosphate checker comes with 10 tests vs 25 in the refill)
- Storage Case - $5
- 100uL Pipette - $20
For a grand total of $116. (new would have been $98 and much cheaper). oh well.
Lesson learned: The price (shipped) should not exceed the price requested plus the reagents (unless they come with new ones) . Subtract the cost of any missing parts or upgrades.
I wouldn't poop on Hanna test because of that. I just didn't do the math right.
Second Lesson - Hanna testers are EXPENSIVE per test.
The cost per test for calcium is $.92
The cost per test for Phosphate is $.36
My RedSea test kit for comparison
The cost per test for calcium is $.24
The cost per test for Phosphate is $.23
I got to play with the calcium test and my results were all over the place. I did some research and found to get accurate results you need to do the following. (calcium test only)
- Clean the cuvette with acid (vinegar), Rinse them in steam distilled water and dry them before using.
- The water to test uses a sample of just .1mL (or 100uL). being off by just one drop will throw the test off by 10% 0r more. This is why they now include a 100uL pipette BTW
- You need 9ml of steam distilled water to complete the test
- Make sure there are NO finger prints on the cuvettes (totally throws off the results)
- Cut the powder packet (really ??) so it makes a funnel. You can get the powder in the cuvette with practice.
- Expect to bow $10 worth of tests to figure all this out.
Now you are doing lab like testing you can get less than hobby grade testing results LOL. The tester is accurate to 6% of the reading. So if the reading is lets say 400ppm the real results could be somewhere between 376 to 424pm What

. Now add user error of one drop of sample or a few grains of reagent and you could be off by and easy -+50 ppm. That is what I got the first tests.
It would be ok if it was consistent and either high or low but its random. I got better results by looking at the cuvette and guessing. glad its easier ……. oh it actually harder than my redsea test to complete. I haven't given up but I wont trust the test. My redsea test is accurate to -+5ppm. With user error like missing the color change I might be off by 10 not hundreds. Also the test cost $.24 per test so I could do 4 for the cost of one Hanna.
The phosphate test is +/- 0.04ppm of reading. Much much more accurate than the calcium. You still need to clean the cuvette like the calcium but you use 10ml of sample water. One drop isn't going to destroy your results. I will test to see how this one works out.
My redsea is still more accurate and cost less per test. It just takes longer. I think a better comparison would be the ULR test. I actually wanted this one for my freshwater tanks.