"does the same thing" is relative. A flip phone does the same thing as a smartphone... runs some applications and makes calls.
The "affordable" is a $200 crappy novelty while the pricier is a $340 professional tool that actually works. Pipes and wires are usually attached to a stud and the thing only detects that "something" is there. The professional tool will show them as they are. HUGE difference.
If I ran a business or did construction work I would not hesitate to get the DeWalt. As a DIY homowner I would get none.





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