Compatible substrates
Coated steel / metal wall
Ultrasonic Thickness Gauges
DR87A
DONGRU DR87A Through-Coating Ultrasonic Thickness Gauge
For wall-thickness inspection where a coated surface requires a suitable through-coating measurement setup.
Request technical guidanceCapabilities / DR87A
What the product record supports.
Four confirmed points: material, measurement, readout and power. Full values are in the specification table below.
Measurement
ultrasonic · 0.55-500mm(steel) / through-coating 3-30mm · ±(0.5%H+0.05)mm
Readout
0.01mm · 2.8-inch color display
Power & body
3.7 V lithium battery (3000 mAh) · 141×69×27mm / 162g（excluding probe）
In practice
Where the DR87A is used
Read wall thickness on painted pipes, hulls and tank walls without grinding back to bare metal — the ultrasonic probe measures the steel through the coating.
01
Painted pipes, no grinding
Through-coating mode
Measure steel walls through the paint or coating on service lines, ship hulls and storage tanks — the surface stays untouched.
In through-coating mode the rated wall range is 3–30 mm; coatings must bond tightly to the metal.
02
Four probes, one platform
High-temp probe < 300 °C
Swap between the standard probe, a cast-iron probe for coarse grains, a high-temperature probe for hot surfaces and a microcrystalline probe for small-curvature parts.
Match the probe to the material and surface temperature before measuring.
03
Rechargeable field work
3.7 V 3000 mAh
500
mm · max steel range
The built-in 3000 mAh cell charges directly, and the 2.8-inch colour screen shows velocity, reading and max / avg / min at 0.01 mm resolution.
Stated accuracy is ±(0.5%H+0.05) mm.
Ultrasonic · 0.55–500 mm (steel) · 0.01 mm resolutionDR87A · Through-coating ultrasonic thickness gauge
Where it stopsThis is a wall-thickness gauge: it reads substrate thickness through the coating, not the coating thickness itself. For paint layer thickness use a magnetic or eddy-current gauge.
Model / DR87A
Technical specifications
Values come from one shared product record; confirm suitability for your measurement task.
0.55-500mm(steel) / through-coating 3-30mm
Measuring range
Confirm your material, measuring method and application before selecting an instrument.
Measurement
- Measurement method
- ultrasonic
- Measuring range
- 0.55-500mm(steel) / through-coating 3-30mm
- Compatible substrates
- Coated steel / metal wall
- Accuracy
- ±(0.5%H+0.05)mm
- Resolution
- 0.01mm
Instrument & environment
- Model
- DR87A
- Product code
- DR-UT-DR87A
- Display
- 2.8-inch color display
- Power supply
- 3.7 V lithium battery (3000 mAh)
- Dimensions / weight
- 141×69×27mm / 162g（excluding probe）
- Operating environment
- standard probe:-10～﹢50℃（high-temperature probe<300℃）, 20%-90%RH
DR87A
Discuss this model
Tell us your material, expected range and site conditions. We can help check the instrument and probe fit.