## Common ground
Both options describe laser levels—devices that use a laser beam to assist with leveling and alignment tasks.
## Options at a glance
**9015.30 – Indoor leveling**
- **Defining trait:** Designed for small-scale, indoor applications like hanging shelves or tiling.
- **Typical examples:** Rotary laser levels for home improvement, cross-line laser levels for drywall.
- **Best fit when:** Used in residential or commercial interiors with short-range precision needs.
**9031.49 – Civil engineering measuring**
- **Defining trait:** Built for large-scale, outdoor construction projects requiring precise measurement of grade, slope, and alignment.
- **Typical examples:** Laser levels used in roadwork, foundation laying, or surveying large sites.
- **Best fit when:** Applied in civil engineering contexts with long-range, high-accuracy demands.
## Key differences
| Feature | 9015.30 (Indoor) | 9031.49 (Civil Engineering) |
|-----------------------|------------------------|------------------------------|
| Scale | Small to medium | Large-scale |
| Environment | Indoor, controlled | Outdoor, variable |
| Primary function | Alignment & leveling | Measuring grade/slope |
| Typical use case | DIY, interior work | Infrastructure projects |
## How to choose
- Is the device used indoors for small tasks like hanging pictures or tiling? → 9015.30
- Is it used outdoors on large construction sites for measuring slope or grade? → 9031.49
## Overlaps & pitfalls
A laser level may serve both purposes (e.g., a high-end model used in both home and site work), but the **main function** determines classification. If the device is primarily for measuring slope/grade in civil projects, it belongs under 9031.49—even if used indoors occasionally. The key is the **primary application**, not versatility