CTN-230 Coating Thickness Gauge

The BRK CTN-230 is a high-precision coating thickness gauge engineered for fast, accurate, and non-destructive measurement of coatings on both ferrous and non-ferrous metal substrates. Ordering Notes: BRK CTN-230 meter and probes are sold separately. Please select the desired probe for your specific application when purchasing this meter. All BRK meters and probes ship direct from the manufacturer and require 5-10 days for shipping. Also see: BRK CTN-230NF By combining magnetic induction for steel surfaces with eddy current technology for non-ferrous materials such as aluminum, copper, and brass, the CTN-230 automatically identifies the substrate and applies the appropriate measurement method, ensuring consistent and reliable results across a wide range of applications. Designed with real-world inspection environments in mind, the CTN-230 delivers excellent repeatability and measurement stability, even when used in demanding industrial settings. Its fast response time allows users to take rapid spot checks or continuous measurements, making it ideal for high-throughput inspection workflows where efficiency is critical. Whether verifying paint thickness on automotive panels, checking plating layers in manufacturing, or ensuring proper corrosion protection coatings, the CTN-230 provides dependable performance with minimal setup. The unit features a clear, easy-to-read digital display that presents measurement values in real time, along with intuitive controls that reduce the learning curve for new users. Its ergonomic handheld design ensures comfortable operation during extended use, while the rugged housing protects the instrument from everyday wear in field and shop environments. Calibration is straightforward, allowing users to maintain accuracy across different materials and coating ranges. The CTN-230 supports both single and continuous measurement modes, giving operators flexibility depending on the inspection task. Its compact size and rechargeable power system make it a highly portable solution for technicians who need reliable coating thickness measurements on-site or across multiple locations. Overall, the BRK CTN-230 offers a well-balanced combination of precision, speed, and ease of use, making it an excellent choice for quality control professionals, inspectors, and maintenance teams who require consistent coating measurements without the complexity or cost of more advanced systems. Dual measurement technology for ferrous and non-ferrous substrates Non-destructive testing of paint, plating, anodizing, and coatings High accuracy with fast response time for efficient inspections Compact, handheld design for field and on-site use Easy-to-read digital display with user-friendly interface Durable construction suitable for industrial environments Applications Paint and powder coating inspection Electroplating thickness measurement (zinc, chrome, nickel) Automotive and aerospace quality control Manufacturing and metal finishing processes Corrosion protection and surface treatment verification Specifications Specification Details Measurement Principle Magnetic Induction and Eddy Current Probe Connection Detachable cable connection (interchangeable probes) Measuring Range 0 to 13,000 µm (probe dependent) Resolution 0.1 µm Operating Conditions 32° to 104°F (0° to 40°C), 20% to 90% RH Statistical Functions Average, maximum, minimum, number of readings, standard deviation Operation Modes Direct mode and group mode Measurement Modes Single and continuous measurement High/Low Alarm Setting Yes Gram Weight Measurement Yes Storage Capacity 10 groups, 1,000 readings Data Output Yes Shutdown Modes Manual and automatic Power Supply AA batteries Available Probes 13 optional probe types   Downloads BRK CTN-230 Series Datasheet BRK CTN-230 Series Users Manual Probes Fe Magnetic Probe Part Number: Fe Magnetic induction probe for measuring coating thickness on ferrous substrates such as steel and iron. Ideal for paint, plating and corrosion protection coatings. Fe High-Temperature Probe Part Number: Fe-HT Designed for coating measurements on hot ferrous surfaces during production processes such as galvanizing and powder coating. NFe Eddy Current Probe Part Number: NFe Eddy current probe for coating thickness measurement on non-ferrous metals including aluminum, copper and brass. NFe High-Temperature Probe Part Number: NFe-HT High-temperature eddy current probe for coating inspection on heated non-ferrous metals such as aluminum components. N400 Probe Part Number: N400 Precision eddy current probe designed for accurate measurement of thin coatings on non-ferrous substrates. N3 Probe Part Number: N3 Extended-range probe for measuring thicker coatings on aluminum and other non-magnetic substrates. F3 Magnetic Probe Part Number: F3 Magnetic probe designed for measuring thicker protective coatings on steel including epoxy and powder coatings. F3 High-Temperature Probe Part Number: F3-HT High-temperature version of the F3 probe for measuring thick coatings on heated steel components. F5 Magnetic Probe Part Number: F5 Wide-range probe designed for heavy protective coatings and thick industrial paint layers on steel. F10 Magnetic Probe Part Number: F10 Extra-wide range probe capable of measuring extremely thick coatings and insulation layers. F400 Magnetic Probe Part Number: F400 Compact magnetic probe designed for precise measurement of thin coatings on ferrous substrates such as steel and iron. F500 Probe Part Number: F500 High-precision probe optimized for measuring thin coatings on small steel components.   Comparison Chart Coating Thickness Gauges CTN-210B CTN-210C CTN-230 CTN-300 BT-T7 BT-T7A Type / Principle Magnetic induction & eddy current coating gauge Magnetic induction & eddy current coating gauge Magnetic induction & eddy current coating gauge.                Magnetic induction & eddy current coating gauge, multi-probe system Through-coating ultrasonic thickness gauge Through-coating ultrasonic thickness gauge Measurement Range Probe dependent, up to 0–10,000 μm Probe dependent, micron to millimeter range ypically up to ~1250 µm Probe dependent, up to 13 mm (13,000 μm) depending on probe 0.7–500 mm (standard mode, steel) 0.7–350 mm (standard mode, steel) Through-Coating Capability Measures coating thickness only Measures coating thickness only Measures coating thickness only Measures coating thickness only Measures substrate thickness through coatings up to 5 mm Measures substrate thickness through coatings up to 3 mm Resolution 0.1–1 μm depending on probe 0.1–1 μm depending on probe Up to 0.1 µm depending on probe Up to 0.1 μm depending on probe 0.01 mm 0.01 mm Accuracy Typically ±(2%H + 1 μm) after calibration Typically ±(1%H + 1 μm) after calibration Approx. ±(1–3%) after calibration Probe dependent, industrial QC grade ±(0.6%H + 0.05) mm ±(0.6%H + 0.1) mm Probe Support Multiple interchangeable probes Multiple interchangeable probes Multiple interchangeable probes Multiple interchangeable probes Standard, micro, coarse and high-temp probes Standard, micro, coarse and high-temp probes Data Handling Group storage with PC export Internal memory with USB/RS232 export Group storage with PC export Data storage with statistical functions Standard thickness readout Standard thickness readout Power Supply Rechargeable lithium battery Rechargeable battery AA Batteries Rechargeable lithium-ion battery Rechargeable Li-ion battery, 160+ hrs typical AA batteries, 50+ hrs typical Primary Use Case Industrial coating thickness measurement Advanced coating inspection with data functions Industrial coating thickness measurement High-end multi-probe coating inspection Substrate thickness through coatings Substrate thickness through coatings, mid-range Probe Comparison