Scope
This MVP identifies ASCII/binary structure, reports size and triangle count, and previews ASCII triangles. It does not repair geometry or infer units.
STL Inspector
Read local ASCII or binary STL metadata. ASCII files also receive a lightweight wireframe preview.
Choose an STL file. It stays on this device.
What the measurements mean
The inspector reads triangle geometry from an STL file and reports its bounding dimensions. STL normally carries no reliable unit metadata, so a width of 25 may mean 25 millimetres, inches or another unit chosen by the originating CAD workflow.
Example workflow
Open a known calibration model, compare the reported bounds with the source CAD dimensions and confirm the expected unit before fabrication. A surprisingly large or small result often indicates a millimetre-versus-inch mismatch rather than damaged geometry.
Limits
This lightweight check does not repair meshes, detect every non-manifold edge, calculate print time or certify a model as safe to manufacture. Keep the source model and validate production-critical geometry in dedicated CAD or slicer software.