Endoscope purchase, what should one pay attention to?

The building structure? Sure.

To get off topic again.

I wanted to pull a doorbell wire through my empty conduit between the house and garage, about 7m long and 110mm in diameter. Unfortunately, I was not able to do so. To find out why, I bought a €30 endoscope from the river supplier.

As already mentioned, the cable is rigid, but once it goes around the corner, it is no longer really suitable.

Attached are a few pictures.





You can decide for yourself whether such quality is sufficient for you.

This is how it looked from the outside when I dug up the damaged spot.



Then, the other day, I also looked into the infiltration system of my sewage treatment plant to see if sewage sludge had settled in the gravel.

[QUOTE="gmt94, post: 431977, member: 32331"
This is how it looked from the outside when I dug up the damage spot.
[/QUOTE]
and the spot where you had to dig, did you find it with the camera? That would already be a success.

25€ Amazon. As described, there are problems with curves, etc. Nevertheless, I had success. Because of the length of the cable, I was able to precisely determine where my empty conduit is damaged. (M25 here) I therefore used it less to see exactly what is damaged, but rather to see if it is damaged anywhere.

[QUOTE="gmt94, post: 431977, member: 32331"
This is how it looked from the outside when I dug up the damaged area.

And the spot where you had to dig, did you find it with the camera?
That would already be a success.
[/QUOTE]

Well, I actually wanted to first find out if something was broken or why I couldn’t get a small blade wire through this huge pipe despite the pull rope.

From the approximate length I pushed in, I was already able to say roughly where it had to be. Unfortunately, I still had to dig and search. ;-(

The question is what image quality a cheap endoscope delivers and how long it lasts. I have worked with professional devices in the aviation sector, which cost four- to sometimes five-figure amounts. If you can live with the cheap version possibly breaking after the fifth use, go for it – if not, then rent one if needed or call a specialist. From my point of view, "reasonable" devices are too expensive for private use unless you have specific hobbies where you, for example, regularly inspect engines or similar.