The most frequently asked concrete questions on selection, measurement, calibration and compliance. Grouped by topic, answered directly, and linked to the relevant in-depth articles.
A coating thickness gauge non-destructively measures the thickness of a coating on a metallic or non-metallic substrate. Which principle applies depends on the substrate material, and reading reliability depends on…
Identifying the substrate takes three steps: magnet test, material confirmation, geometry check. Ferromagnetic substrates use the magnetic method, non-magnetic conductive substrates use eddy current, and non-metallic substrates use ultrasonics —…
An accuracy expression has a proportional term and a fixed term; you must convert it to a specific thickness point to compare. Calibration is done by the manufacturer, verification is…
Range selection is based on the 80th percentile of typical thickness, keeping it in the 20%-80% band; once over-range the reading enters a non-linear region that cannot be corrected by…
Ultrasonic thickness measurement converts thickness from echo time, so coupling quality and sound-velocity setting decide reading reliability. The Echo-Echo penetrating mode measures substrate wall through paint, but covers a limited…
Coatings on concrete, wood, plastic, glass and fibreglass can only be measured by ultrasonics (ASTM D6132-13(2022) / ISO 2808); the matching Dongru models are DR200A (concrete/mortar, 40-1200μm) and DR200B (wood/plastic/glass,…
US window tint is legislated state by state; the most common front-side limit is 35%, with some states requiring 50% or 70%. Because factory glass transmits about 70%, the net…
Coating thickness measurement spans ASTM (D7091, D6132), SSPC/AMPP (PA 2), ISO (2178, 2360, 2808, 19840, 12944) and NIST traceability systems; the rule is pick the standard family by substrate, pick…
The two “passes” into the professional market are a traceable calibration certificate and a declaration of conformity to standards; also, products with wireless modules need FCC certification in the US,…
Daily care of a thickness gauge centres on four parts: the probe (wear part), the foil (needs verification), the battery (affects stability) and the body and connectors; most “faults” are…
