HDER G-01 Geiger Counter – Untested, Sold As Pictured (Used)

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Description

This is an HDER G-01 Geiger counter, a used radiation detection device.

FNIRSI GC-01 Geiger Counter - Reliable Radiation Detector

It's being sold as pictured and untested – meaning it may work, it may not, but you're buying it in its current condition.
It's a used item, so it might have some cosmetic signs of wear, but it's not guaranteed to be functional.
The seller says "untested" so this is for parts or repair, or for someone who knows how to check it out.

RADIAC USA G-01 Hder Dual Probe Geiger Counter Uranium

It's a Geiger counter, so it detects ionizing radiation – beta, gamma, maybe alpha depending on the tube.

Geiger Counter Unit at Jack Oneill blog

No specific brand other than HDER.

GEIGER COUNTER KIT Geiger Counter Kit Open Source 25 volte/min

No MPN or UPC.

1 JD-3001 DIGITAL Geiger Counter Nuclear Radiation Detector Dosimeter

If you're a radiation hobbyist, or you need a cheap unit to tinker with or harvest parts, this could be a gamble worth taking.
Just don't expect it to work out of the box.

NUCLEAR RADIATION DETECTOR GC-01 Geiger Counter Radiation Dosimeter X

Sold as-is, no returns likely.
Good for experimentation or as a display piece.

Geiger Counter - 1908 - Magnet Academy