# Total Depth

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**Total Depth** is the sum of all individual [Layer Depths](glossary-of-measurement-parameters-layer-depth.md) of a coating stack, as measured by the [Boring Thickness Module](rhopoint-appearance-elements-using-aesthetix-with-ae-aesthetix-modules-boring-thickness-module.md), in micrometres (µm).

### Definition

> **Total Depth [µm]** = Σ Layer Depth_i  for i = 1 … N − 1

where N is the number of detected rings in the Säberg-drilled crater and N − 1 is the number of resolved layers.

### Interpretation

Total Depth represents the **complete dry-film thickness** of the coating system between the outermost detected ring (top of the coating) and the innermost detected ring (deepest measured layer).

This value can be cross-checked against an independent non-destructive total dry-film thickness measurement (magnetic, eddy-current) on the same sample. A close match validates the boring measurement; a large discrepancy usually points to either:

- A wrong [Drill Angle](glossary-of-measurement-parameters-drill-angle.md) (most common cause),
- A miscalibrated mm/pixel scale of the Aesthetix Aspec camera, or
- One or more missing rings — in particular a missing innermost ring will make the Total Depth appear smaller than the true total dry-film thickness.

### Units

Always reported in micrometres (µm), formatted with two decimal places.

### In Appearance Elements

- **Column:** Total Depth in the Boring Thickness data table
- **Detail view:** Shown as "Total Layer Depth" alongside the per-layer table in the expanded result panel.

See also: [Layer Depth](glossary-of-measurement-parameters-layer-depth.md), [Drill Angle](glossary-of-measurement-parameters-drill-angle.md), [Boring Thickness Parameters](rhopoint-appearance-elements-using-aesthetix-with-ae-aesthetix-modules-boring-thickness-module-boring-thickness-parameters.md).