This kit contains two gallons of AmTech 300 Boiler Treatment and one test kit to be able to test Nitrite levels in your boiler fill water easily and accurately just like the lab, and ensure that you are keeping your boiler water at its optimal chemical balance. Proper chemical levels within your system are essential to its performance and system protection. The test kit can be used for up to 10 tests, and only works with out AmTech300 and ProTech300 boiler treatments.