before i bought the API Master Test Kit, i had bought a different liquid test kit, that was on clearance for $20 it's called Fresh Lab Deluxe by a company called Red Sea. it worked fine, but didn't include a test for Nitrates. but alot of other ones like Hardness. well anyways, inside the instruction booklet for testing ammonia, they included this chart, showing Ammonia Toxicity levels when at different temps and PH levels. i'd like to discuss this, and hear people's opinions on how accurate this is. attached is a scan of the chart.