What are some tools that can be used to find a finding the exact location of a foreign body object inside someone?

I'm interested in both:

1. Low-tech tools that almost everyone in the world either [a] has access to or [b] can DIY build fairly trivially and

2. High-tech tools that only well-funded hospitals have access to

Examples off the top of my head to "see inside the body" include xrays and ultrasound, neither of which are low-tech.

What are some tools that can be used in the field to find the exact location of a foreign body object for removal (eg a splinter buried in someone's foot for weeks/months).

What are some tools that can be used to find a finding the exact location of a foreign body object inside someone?

I'm interested in both:

1. Low-tech tools that almost everyone in the world either [a] has access to or [b] can DIY build fairly trivially and

2. High-tech tools that only well-funded hospitals have access to

The American Family Physician VOLUME 67, NUMBER 1 published an article in June 2003 titled Splinter Removal, which suggests a few high-tech imaging tools, including X-rays, Ultrasound, Xeroradiographs, CT scans, and MRIs.

But I could not find any reference to low-tech imaging tools to see the foreign body without a very, very expensive machine.

What are some tools that can be used in the field to find the exact location of a foreign body object for removal (eg a splinter buried in someone's foot for weeks/months).