Laser spot distribution measurement

I cannot remember exactly, but we're talking a few hundred dollars. They're not simply a quick and handy gauge, they're a NIST traceable instrument.

To measure the laser you need 1 meter of distanze from laserchek or the power is a mistake and is not real power! it is easy to measure at 10cm !

Rubbish!
If you're using a laser which leaks IR then close-up measurements will confuse the LC.
From a properly filtered laser (or one which does not rely on pumping a lasing crystal - such as a diode laser), a few centimetres from the aperture is about correct.

I built my first HeNe back in 1990 and my experience isn't limited to cheap green "laser pointers".
Go back to the top and read my post about MONOCHROMATIC light sources.
which DPSS greenies aren't - they generally leak a certain amount of IR and the cheaper the laser, the more IR they usually leak and unscrupulous suppliers will rate the output of their lasers based on the ENTIRE output rather than simply the 532nm component.

When reading cheap and nasty greenies at a distance, the reading is still inaccurate, just not quite as inaccurate - This is because the IR is not collimated and it spreads out. At close quarters, a lot of the IR falls on the LC window.
I've taken IR sensitive photos which proves this and I've done a fair amount of experimentation with the LC.
It's not a good idea to try to teach your granny to suck eggs.

It's called a LaserCheck from a company called Coherent.
If I remember correctly, I got mine from a retailer called Proline.
They're almost iconic in the laser industry and to a laser technician, they're as a thermometer is to a ward nurse.
It's not the only make and model of laser power meter, but they're one of the least expensive and most convenient to use as long as the source is monochromatic (the sensor being optical rather than thermal).