There are two main types of test employed for property methamphetamine testing.
Both types are designed to determine the presence or level of methamphetamine residue in a given sample area, usually 100cm². Both tests are relevant and have a legitimate place in forensic science provided they are used correctly and samples are taken in accordance with good scientific practice.
Your local tester is trained to discuss the appropriate test with you so that you are informed of the strengths and limitations of each.