Compatible substrates
Ferrous metal
DONGRU DR9000A Fire-Resistant Coating Thickness Gauge
Coating Thickness Gauges
DR9000A
For thicker fire-protection and heavy-duty protective coatings on suitable metal structures.
Request technical guidanceCapabilities / DR9000A
Four confirmed points: material, measurement, readout and power. Full values are in the specification table below.
Ferrous metal
magnetic · 0-10000μm · ±3%H+2μm
0.1μm/1μm/0.01mm · 2.8-inch color display
3.7V lithium battery(2000mAH) · 141×69×27mm / 242g
In practice
Read thick fire-protective and heavy-duty coatings up to 10 mm on steel, with a Φ20.5 mm spot that still fits formed sections and curved members.

01
0–10000 μm
Measure intumescent and heavy-duty protective systems on steel up to 10 mm in a single reading.
Ferrous steel only — not for aluminium or other non-ferrous substrates.
02
Φ20.5 mm minimum area
A Φ20.5 mm contact area and 0.5 mm minimum substrate keep thick-coating checks practical on formed sections.
At curved parts the radius must be at least 10 mm convex or 50 mm concave.
03
3.7 V 2000 mAh
10000
μm · measuring range
Reading, group number and max / avg / min show on the 2.8-inch colour screen; the 2000 mAh cell recharges on site.
Stated accuracy is ±3% of H + 2 μm.
Where it stopsFerrous metal substrates only. Not for non-ferrous metals, and not for coatings on plastic or concrete.
Model / DR9000A
Values come from one shared product record; confirm suitability for your measurement task.
Measuring range
Confirm your material, measuring method and application before selecting an instrument.
DR9000A
Tell us your material, expected range and site conditions. We can help check the instrument and probe fit.