Industrial Test Systems 484020 Cyanide Emergency Test Kit, 0.2-1700 ppm Range

Haven't used yet, seems simple enough to use, color identification basically makes it almost foolproof. Was missing a conical test tube tho, that's why I took a star away

The way the test works you use two different strips per test, so for two tests the package should contain 4 strips. One of the four pouches was just empty, nothing inside, so I was only able to perform 1 test. Naturally I drove out to the second location before discovering that the sealed pouch for the second test was actually empty, wasting a bunch of time.I wouldn't recommend this product. The price per test is very high compared to the other options. You think you're saving a couple of bucks to get this tiny kit if you don't need to perform 50~100 tests, but their quality control is not very good if they're shipping out empty pouches with no test strips inside.