## Common ground
All are laboratory or medical devices used to transfer precise volumes of liquid.
## Options at a glance
**3926.90 – Plastic**
- **Defining trait:** Made primarily from plastic, often disposable.
- **Typical examples:** Disposable serological pipettes, graduated plastic pipettes.
- **Best fit when:** Reusable or single-use lab work with low contamination risk; cost-sensitive settings.
**7017.90 – Glass**
- **Defining trait:** Made from glass, typically reusable and heat-resistant.
- **Typical examples:** Volumetric pipettes, Pasteur pipettes (glass), graduated glass tubes.
- **Best fit when:** High precision, sterilization needs, or repeated use in research labs.
**8479.89 – Electronic/Digital**
- **Defining trait:** Uses electronics for volume control, measurement, or automation.
- **Typical examples:** Digital pipettes, electronic multichannel pipettes, programmable dispensers.
- **Best fit when:** High accuracy, repetitive tasks, or integration with lab software.
## Key differences
| Feature | 3926.90 (Plastic) | 7017.90 (Glass) | 8479.89 (Electronic) |
|------------------|-------------------|-----------------|------------------------|
| Material | Plastic | Glass | Mixed (plastic/glass + electronics) |
| Reusability | Usually single-use| Reusable | Reusable |
| Precision Control| Manual | Manual | Digital/automated |
## How to choose
- Is the pipette made of plastic and meant for one-time use? → 3926.90
- Is it glass, reusable, and used in precise lab work? → 7017.90
- Does it have digital display, programmable volume, or electronic control? → 8479.89
## Overlaps & pitfalls
A pipette can be both plastic *and* electronic (e.g., a disposable plastic digital pipette), but the **electronic function** takes priority in classification if present. If unsure, base choice on the product’s **main function**: manual transfer vs. automated control. Avoid confusion with "glass" when plastic has a glass-like appearance