UNI‑T UT343A Paint Thickness Gauge – High‑Precision Coating Measurement

The UNI‑T UT343A is a high‑performance paint thickness gauge designed for accurate, non‑destructive measurement of coating thickness on both ferrous (Fe) and non‑ferrous (NFe) metal substrates. With advanced sensing technology, durable construction, and multiple measurement modes, the UT343A is widely used in automotive inspection, metal processing, aerospace, marine engineering, railway transportation, scientific research, and industrial quality control.

Measurement Range: 0–1750 μm

The UT343A supports a wide measurement range from 0 to 1750 μm, allowing technicians to detect thin coatings, thick layers, repainting, filler, and industrial coatings with high accuracy. Readings above 1750 μm display “OL”, and values beyond 2000 μm cannot be measured.

Why the UT343A is Ideal for Automotive Paint Inspection

When inspecting used vehicles, the UT343A helps identify repainting, filler, and bodywork repairs by detecting variations in coating thickness. Its precision makes it an essential tool for car dealers, inspection centers, and buyers who want to verify the true condition of a vehicle.

• Detects repainting and hidden body repairs
• Identifies filler and putty layers
• Distinguishes factory paint from aftermarket paint
• Provides accurate readings for professional reporting

⚙️ Measurement Principles

The UT343A operates using two scientific measurement principles:

• Electromagnetic Induction (Fe): For coatings on magnetic metals such as iron and steel.
• Eddy Current (NFe): For coatings on non‑magnetic metals such as aluminum and copper.

These dual modes allow the device to measure non‑conductive coatings on both magnetic and non‑magnetic substrates with high precision.

Package Contents

• UT343A Paint Thickness Gauge
• User Manual
• Standard Thickness Shims (5 pcs)
• Ferrous Substrate
• Non‑Ferrous Substrate
• Sensor Protection Cap
• Two AAA Alkaline Batteries

 Key Features

• Complies with GB/T 4956 (magnetic method) and GB/T 4957 (eddy current method)
• Supports Fe and NFe measurement modes
• Automatic substrate recognition
• High‑precision, corrosion‑resistant sensor
• Single‑point and multi‑point averaging modes
• Fast judgment mode for quick inspections

 Safety Instructions

• Keep the sensor away from metal objects during startup (minimum 5 cm)
• Avoid strong electromagnetic fields
• Keep the sensor clean and free from dust or oil
• Do not store the device in high‑temperature or high‑humidity environments
• Replace batteries when the low‑power indicator appears
• Do not disassemble or modify the device

Device Structure

• LED warning indicator
• LCD display
• Power button
• Value increase (+) button
• Screen rotation / cancel / delete button
• Value decrease (–) button
• High‑precision sensor unit
• Battery compartment

How to Use the UT343A

Power On/Off:

• Press and hold the power button to turn on
• Press and hold again until “OFF” appears to turn off

Normal Measurement:

1. Turn on the device and wait for initialization
2. Select a suitable calibration shim
3. Choose the correct substrate (Fe or NFe)
4. Place the sensor vertically on the surface and measure

Notes:

• Keep the device perpendicular to the surface
• Readings above 1750 μm show “OL”
• Values above 2000 μm cannot be measured

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