Voltcraft SDM-115 Coating Thickness Gauge, Paint Layer Measurement 0 - 1000 µm (0 - 40 mils)

Measuring coating thickness on metal surfaces can be a challenge without the right tool—especially when you need reliable readings on both ferrous and non-ferrous substrates. The Voltcraft SDM-115 Coating Thickness Gauge solves this problem with dual-mode technology: magnetic induction for steel and iron, and eddy current for aluminum, copper, and other non-magnetic metals. It measures paint, lacquer, plating, and other non-conductive coatings from 0 to 1000 µm (0 to 40 mils) with high precision and a clear backlit display.

Who is it for

This gauge is ideal for automotive painters, quality control inspectors, metal fabricators, corrosion engineers, and DIY enthusiasts who need to verify coating thickness on car bodies, appliances, structural steel, or metal parts. Whether you're checking paint thickness on a vehicle, ensuring powder coating uniformity, or assessing protective layers on industrial equipment, the SDM-115 delivers accurate, repeatable results in seconds.

Main features

• Dual measurement principle: magnetic induction (Fe) and eddy current (NFe) for automatic substrate recognition
• Wide measuring range: 0 - 1000 µm (0 - 40 mils) with selectable units
• High accuracy: ±(3% + 2 µm) in the 0-500 µm range and ±(3.5% + 2 µm) in the 500-1000 µm range
• Fine resolution: 0.1 µm for readings up to 100 µm, 1 µm above 100 µm
• Backlit LCD for easy reading in low-light conditions
• Memory storage for 400 readings in 4 groups of 100
• Multiple calibration modes: zero-point, 2-point, and multi-point for enhanced accuracy
• Data hold function freezes the current reading on the display
• Auto power off after 5 minutes of inactivity to save battery life
• Low battery indicator alerts you when replacement is needed

Specifications

• Measurement principle: Magnetic induction (Fe) / Eddy current (NFe)
• Measurement range: 0 - 1000 µm (0 - 40 mils)
• Accuracy (0-500 µm): ±(3% + 2 µm)
• Accuracy (500-1000 µm): ±(3.5% + 2 µm)
• Resolution (0-100 µm): 0.1 µm
• Resolution (>100 µm): 1 µm
• Substrate compatibility: Ferrous (Fe) and non-ferrous (NFe) metals
• Display: Backlit LCD
• Units: Micrometers (µm), mils
• Calibration modes: Zero-point, 2-point, multi-point
• Memory: 400 readings (4 groups of 100)
• Power supply: 2x AAA 1.5V batteries
• Operating temperature: 0 to 50 °C
• Auto power off: Yes (after 5 minutes)
• Minimum measurement area: Ø 6 mm
• Minimum substrate thickness (Fe): 0.3 mm
• Minimum substrate thickness (NFe): 0.05 mm
• Data hold function: Yes
• Low battery indicator: Yes

Tips

For best results, clean the test surface to remove dust, oil, or loose particles before measuring. Calibrate the gauge on an uncoated substrate of the same material as your test piece, especially when switching between ferrous and non-ferrous metals. Avoid measuring near edges, holes, or curved areas where the probe cannot sit flat. The gauge automatically powers off after 5 minutes, but you can press any key to wake it up and resume measuring.