For proper infection control, both associations recommend a TVC less than 200cfu/mL. I currently have an in-office incubator, can I use this for the E|Line water testing vials? The incubator must be a dry block incubator with a temperature of 37˚C. Ensure the vials fit properly into the incubator wells. If the wells are too large, the test results can be inaccurate as too much space will provide inconsistent incubating temperatures.