> For the complete documentation index, see [llms.txt](https://docs.sevenpens.com/drawtab/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sevenpens.com/drawtab/process/magnet-field-detection.md).
# Magnet field detection
## Overview
For some devices — especially standalone drawing tablets — it is useful to check where magnets are located. For this purpose, I use a magnetic field viewing film.
For more information about how these films work, see [Magnetic field viewing film](https://en.wikipedia.org/wiki/Magnetic_field_viewing_film).
## My equipment
The one I use is a 4" × 4" square film. When pressed against a device's surface, it reveals magnetic fields. It costs about $18 USD on Amazon.
Link: [Amazon product page](https://www.amazon.com/dp/B0952FJWNZ)
## Examples
Example 1 — Magnets detected in the lower-right corner of a Wacom MovinkPad Pro 14. This is one of four sets of magnets along the bottom edge.
Example 2 — Magnets in an iPad. Magnets appear around all edges of an iPad. Below are two examples.
