API COPPER TEST KIT 90-Test Aquarium Water Test Kit

Good to have this to check, but all good

Wanted to test the water straight from the tap. This works and it appears to pick up even trace amounts. Distilled water has none according to this kit just as you would expect, Tap water has just the tiniest amount, so it's good to know it can pick up such a small amount.

Im assuming that this is working well, and have never returned a positive test result, which is good if its correct. I have found API test kits to be very hit and miss in the past with other false zero's for various products.

Box came crushed but everything inside was ok. I'm assuming the reading is accurate as it's telling me 0ppm and my axolotl seems to be happy. I also have the api master test kit and this copper test kit is to a similar quality

Super easy to use and I think its accurate!

Use this all the time, after treating my marine fish.

good value

The testing colors don't always match the chart and it's often very difficult to tell the difference in color/shades between 0.25 -1.0 as the colors in the chart are all very similar, yet at the same time, it's a big difference in copper levels that could either heal or kill your fish. Not ideal.

Great product....& price

Very easy to use and understand results.

Initial review: After following the instructions very specifically, I was unable to get a reading of copper after I dosed Cupramine into my 10 gallon quarantine saltwater tank. However, after letting the test tube sit for a day, I was able to get a copper reading. Read below for the full review and results: EDIT: After letting the test tube sit for an entire day, I can actually distinguish a copper reading that seems to be nearly accurate with the amount of Cupramine I dosed. I tested ANOTHER sample of the same water, and got copper color immediately? Both tests look identical and it is actually reading right about 0.5mg/L. I am not sure if I should trust the readings, although they would be spot on with the amount of Cupramine I dosed. I'll test it with a Seachem test kit tommorow and update this review. Also make sure to follow the directions precisely, you need to remove the cap and look down the test tube with the white background of the color under the tube, but don't let the tube sit directly on top of the card, the color will appear much darker. Hold the test tube above the card an inch or two. EDIT #2 02/19/18: The Seachem Copper Test kit arrived and the results are in: 0.5mg/L. Right at the amount I dosed. Tested again today with also the API Copper Test kit. Results again, are the exact same. 0.5mg/L. This means (in my case) both the API Copper Test Kit and the Seachem Test Kit are both precise measuring tools if you are dosing Cupramine.

I've been doing marine/reef tanks over 30 yrs. And reviewing experienced fish Keepers, you can learn a lot. Use of copper for fish parasites is highly effective, but deadly if strict instructions are not met! This copper test is ok for experienced fish/aquariest. But i recommend a more accurate for the beginners and novice hobbiest. And most of all, time and patience must be followed.

Says to use a colour card but there isnt one in the box. Not sure where to get a colour card.