Measuring and Layout — FAQ
Can these gauges measure paint thickness on plastic car bumpers?
Only ultrasonic gauges like the Industrial-882 measure plastic bumpers. Magnetic gauges require metal substrates and cannot read paint on plastic, fiberglass, or carbon fiber panels. Always verify material compatibility before purchasing.
Do I need special training to use an ultrasonic thickness gauge?
Basic operation takes 15 minutes to learn, but proper couplant application and sound velocity settings require practice. The Industrial-882 includes auto-calibration that simplifies setup for common materials, making it accessible to DIY users.
What's the difference between mil and micron measurements?
One mil equals 25.4 microns (μm). Automotive paint typically measures 4-6 mils (100-150 μm) from the factory. Our top picks display both units, allowing you to match manufacturer specifications or industry standards.
How accurate are sub-$50 thickness gauges compared to professional models?
Budget gauges achieve ±3% accuracy versus ±1% for $200+ professional units. For DIY and most professional applications, this 2% difference is negligible. The Industrial-882's ultrasonic technology rivals $150 instruments in our testing.
Can I measure through rust or paint buildup?
Ultrasonic gauges measure through paint and light rust but struggle with heavy scale. Magnetic gauges measure total coating thickness including rust layers. For corrosion assessment, remove loose debris and measure substrate thickness directly.
Why do some gauges require couplant gel?
