GQ GMC-320 Plus V4

I've been looking for a low-cost detector than I can take on my travels, and which can store data for later downloading/uploading, and with the prices dropping quite a bit, well at least in euro terms, the GQ GMC-320 V4 fits the remit perfectly.

Having used it for a few hours now I'm very impressed by it. The Li-ion battery is replaceable, it has a backlight, it's very customisable, it stores data, it can be used in realtime to upload data, the tube can be replaced, it can be powered from the mains or battery, it can be permanently fixed to a wall, it can be calibrated , it's a perfect size and weight for travelling, it fits in a zip-lock bag easily to avoid contamination and water ingress, it comes with both car and home chargers and a data cable. I could go on.....

Brilliant!

I think there's enough room in the casing to fit a SBM-20, with a bit of modding you could fit and calibrate this tube.

Sure the decals make it look a bit like a toy, and it's not the toughest plastic case ever made, but for the money it's very good.

I think the M4011 tube is great for background and that what it's factory calibrated for. For testing high activity samples, I think it would struggle. I just want it for travelling to see changes in the general background radiation levels and to test rocks.