The Multi Finger Scratch/Mar Tester 710 is a precision instrument designed to evaluate the scratch resistance and marring properties of various materials. While this instrument is generally reliable, there are several factors that can cause it to malfunction or produce inaccurate results. Some of these factors include:

Improper calibration: The Multi Finger Scratch/Mar Tester 710 requires regular calibration in order to ensure accurate and consistent results. If the instrument is not calibrated properly, it may produce inaccurate readings or malfunction.

Worn or damaged components: The scratch and mar heads of the instrument are designed to be replaceable, but if they become excessively worn or damaged, they may produce inaccurate results or cause the instrument to malfunction.

Contaminants on the sample or instrument: Dust, dirt, or other contaminants on the sample or instrument can interfere with the scratch or mar test and cause inaccurate results.

Inappropriate test parameters: The test parameters for the Multi Finger Scratch/Mar Tester 710 should be selected according to the specific properties of the material being tested. If the wrong parameters are selected, the instrument may produce inaccurate results or malfunction.

Incorrect sample preparation: The sample preparation process is critical to obtaining accurate results with the Multi Finger Scratch/Mar Tester 710. If the sample is not properly prepared, it may not be representative of the material's actual scratch and mar resistance.

Electrical or mechanical issues: The Multi Finger Scratch/Mar Tester 710 is an electrical and mechanical instrument, so any issues with its power supply, wiring, or mechanical components can cause it to malfunction or produce inaccurate results.

Environmental factors: Temperature, humidity, and other environmental factors can affect the performance of the Multi Finger Scratch/Mar Tester 710. If the instrument is operated outside of its specified environmental conditions, it may produce inaccurate results or malfunction.

To avoid these issues, it is important to follow the manufacturer's instructions for calibration, sample preparation, and test parameters when using the Multi Finger Scratch/Mar Tester 710. Regular maintenance and replacement of worn or damaged components can also help to ensure the instrument remains in good working order. If the instrument does malfunction, it should be inspected and repaired by a qualified technician to ensure its continued accuracy and reliability.