Start with the visual check: look for clean edges, an even shade across the panel and no dirt trapped under the film once it has cured. For heat, installers use an infrared meter, but you can get a rough sense yourself by parking in the sun, waiting until the film has fully cured, and comparing the warmth you feel through a tinted window against untinted glass. It is a simple comparison rather than a measurement, but it tells you the film is doing something.
To talk through film options for your Tesla in Adrian, Michigan, use our quick quote