The Engine shows a solid red light after completing a test.

When a test is complete, the Engine displays a solid green light for 3 minutes.  Be sure to read your Prop results within these 3 minutes for a valid result.  If the Prop is left in the Engine for longer than three minutes, the red light will illuminate indicating that the result is now invalid and you will need to run another test with a new Prop, dropper, sticker, and any remaining sample in the collection cup.

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