This is a great question about hair clippers! To get a haircut that's so short it feels almost like there's no hair at all, you definitely need specific tools.

The Secret to a Super Short, Almost Shaved Look:

To achieve the extremely short length you're describing, between 0.1 mm and 0.5 mm, ordinary household hair clippers and their protective combs (guide combs) won't work. The key here is: No comb protection: You must remove all guide combs, allowing the clipper blades to directly contact the skin.
Specialized blades: Even without guide combs, the design of the clipper blades varies significantly.

Two Tools for Achieving Extreme Shortness:

To achieve this "stubble-like" ultra-short effect, you need to look for the following two types of tools:

1. Zero-Gapped Hair Clippers:

These clippers are specifically designed for the precise work of barbers and can be adjusted to a "zero-gap" setting.
Principle: Zero-gap means the distance between the fixed blade and the moving blade is adjusted to be extremely close, with almost no gap.
Effect: They can leave very, very short stubble, approximately 0.5 mm or even shorter, making them the preferred choice for clean hairlines, sideburn trimming, and creating the base for fade haircuts.
Keywords for searching: Search for "zero-gap hair clippers" or "trimming clippers."

2. Professional Baldness Clippers / Foil Shaver:

If you want an even shorter result than zero-gap clippers, a smooth finish like a fresh shave with a razor, then you need a different tool, which usually looks more like an electric shaver used for men's beards.
Principle: This tool uses an extremely thin metal mesh (called a "foil" or "blade screen") to protect the skin and cut the short stubble that passes through the mesh holes.
Effect: It can further flatten hair that has already been cut to the shortest length with ordinary clippers (around 0.5 mm), achieving a result close to 0.1 mm or even smoother. This is the tool for truly achieving a bald look. Shopping Keywords: Search for "bald head clippers," "foil shaver," or "trimmer."

Usage Tips

Regardless of the type, please remember:
Clean skin: Ensure your skin and hair are clean before use.
Slow and gentle: Especially when using a foil shaver, push gently and avoid pressing hard to prevent skin irritation.
Regular maintenance: Keep the blades clean and lubricated to ensure the cleanest cut every time.