The Liqui-Cult Fuel Test kit easily demonstrates and quantifies bacterial and fungal growth in fuels and other fluids. Just inject a small amount of the fuel you are testing with a syringe into the test bottle, shake well and compare color of fluid to a chart after a certain amount of time. Each Liqui-Cult Fuel Test kit comes complete with 10 sealed test bottles, 10 sterile packed syringes and instructions.