Metravi CTG-01 Coating Thickness Gauge

A. Product Overview

The Metravi CTG-01 is a digital coating thickness gauge designed for fast, accurate and non-destructive measurement of surface coatings. It can measure non-magnetic coatings such as paint and zinc applied over steel, as well as insulating coatings such as paint and anodised layers applied over non-ferrous metals.

The instrument automatically selects the appropriate measurement technology according to the substrate, or the required probe type can be selected through the menu. Its compact construction makes it suitable for laboratory, workshop, production-floor and outdoor inspection work.

Key Features

• Measures coatings on ferrous and non-ferrous metal substrates
• Measuring range from 0 to 1250 µm
• Magnetic induction and eddy current measurement
• Automatic or manual substrate selection
• Single and continuous measuring modes
• Direct and group operating modes
• Statistical display for average, maximum, minimum, number of readings and standard deviation
• One-point and two-point calibration
• Easy zero calibration
• Four measurement groups
• High and low alarm settings
• Backlit LCD for low-light environments
• Low-battery and error indications
• USB interface for PC analysis
• Auto power-off function that can be disabled through the menu
• Spring-mounted probe for stable contact pressure
• V-groove probe sleeve for measuring small cylindrical components

B. Working Principle

The Metravi CTG-01 uses two different measuring principles depending on the base material.

Magnetic Induction Principle

When the coating is applied over a ferrous substrate such as steel, the instrument uses magnetic induction. The probe detects changes in the magnetic field caused by the distance between the probe and the metal surface. This distance represents the thickness of the non-magnetic coating.

Typical coatings measured on steel include:

• Paint
• Zinc
• Enamel
• Plastic coating
• Protective coatings
• Powder coating

Eddy Current Principle

When the coating is applied over a non-ferrous metal such as aluminium, the instrument uses the eddy current principle. The probe generates an alternating electromagnetic field, which creates eddy currents within the metal substrate. Changes in these currents are used to determine the thickness of the insulating coating.

Typical coatings measured on non-ferrous metals include:

• Paint on aluminium
• Anodised coating
• Lacquer
• Plastic coating
• Protective insulating layers

The same probe supports measurements on both ferrous and non-ferrous metal substrates, making the CTG-01 suitable for varied coating inspection requirements.

C. Why the Metravi CTG-01 Is Used

The Metravi CTG-01 is used to verify whether a coating has been applied within the specified thickness range. Proper coating thickness is important for corrosion protection, appearance, durability, adhesion and compliance with quality standards.

A coating that is too thin may not provide adequate corrosion resistance or surface protection. A coating that is too thick may cause cracking, peeling, uneven finishing, extended drying time and unnecessary material consumption.

The CTG-01 helps users:

• Check paint thickness without damaging the surface
• Maintain consistent coating quality
• Inspect finished products before dispatch
• Verify coating thickness during production
• Evaluate corrosion-protection layers
• Identify repaired or repainted automotive panels
• Compare measurements across different surface areas
• Record and analyse coating readings
• Set high and low thickness limits
• Reduce paint and coating wastage
• Improve quality-control documentation
• Inspect curved and cylindrical metal components

D. Suitable Buyers

The Metravi CTG-01 Coating Thickness Gauge is suitable for:

• Automobile manufacturers
• Automotive workshops
• Used-car inspection companies
• Vehicle service centres
• Paint shops
• Powder-coating companies
• Electroplating units
• Metal fabrication companies
• Steel product manufacturers
• Aluminium product manufacturers
• Chemical-processing industries
• Shipbuilding companies
• Aircraft maintenance and manufacturing companies
• Corrosion-protection contractors
• Industrial quality-control departments
• Inspection agencies
• Testing laboratories
• Engineering consultants
• Production supervisors
• Maintenance professionals
• Light and heavy engineering industries

Frequently Asked Questions

1. What does the Metravi CTG-01 measure?

The Metravi CTG-01 measures the thickness of paint, zinc, anodised coatings and other non-magnetic or insulating coatings applied over ferrous and non-ferrous metal surfaces.

2. What is the measuring range of the Metravi CTG-01?

The coating thickness measuring range is 0 to 1250 µm, equivalent to approximately 0 to 49.21 mils.

3. Can the CTG-01 measure paint thickness on steel?

Yes. It uses the magnetic induction principle to measure non-magnetic coatings such as paint and zinc over steel and other ferrous substrates.

4. Can it measure coatings on aluminium?

Yes. It uses the eddy current principle to measure insulating coatings such as paint and anodised layers on aluminium and other non-ferrous metal substrates.

5. Does the user need to select the substrate manually?

The instrument can identify and select the measuring principle automatically. The required probe mode can also be selected through the menu when necessary.

6. Is the Metravi CTG-01 a destructive testing instrument?

No. It performs non-destructive coating thickness measurement, meaning the coating does not need to be cut, scratched or removed during inspection.

7. What are Direct and Group modes?

Direct mode is suitable for quick and occasional measurements. Group mode is suitable for organised measurement sessions where readings need to be stored and statistically analysed in separate groups.

8. Does the instrument provide statistical analysis?

Yes. It can display average, maximum, minimum, number of readings and standard deviation values.

9. Can high and low coating limits be set?

Yes. High and low alarm limits can be configured to help identify readings outside the permitted coating thickness range.

10. Can measurement data be transferred to a computer?

Yes. The gauge includes a USB interface and PC analysis software for transferring and reviewing measurement data.

11. Can the CTG-01 measure curved surfaces?

Yes. The probe sleeve includes a V-groove that supports stable measurement on small cylindrical components. The minimum curvature requirement depends on whether the substrate is ferrous or non-ferrous.

12. Does the gauge require calibration?

Calibration is recommended for reliable measurements. The CTG-01 supports zero calibration, one-point calibration and two-point calibration.

13. Is the display readable in dark areas?

Yes. The LCD includes a backlight for improved visibility in workshops, inspection areas and low-light environments.

14. What accessories are supplied with the gauge?

The standard package includes the coating thickness gauge, two 1.5 V batteries, a hard carrying case, operating manual, steel and aluminium calibration substrates, USB connecting cable and Windows analysis software.

15. Is the Metravi CTG-01 suitable for automotive paint inspection?

Yes. It can be used to compare paint thickness across vehicle body panels and help identify variations that may indicate repainting, repair work or uneven coating application.