This is a nano-amp-meter spin-off. The original design is on eevblog but not available for sale anymore, so I made my own, and changed a bunch of stuff, manufactured and tested.

A Professional Precision Current Adapter for Multimeters. The only low cost industry solution for multimeter burden voltage and nanoamp level current measurement.

It solves the problem of burden voltage on a multimeter. It also turns your multimeter into a powerful and precise nanoamp level measurement tool!

The best part is if you hook it to an oscilloscope you can measure/plot/store transient nano-amp current events for which you will need a really expensive logging nano-amp current meter, somewhere around a few thousand $$$$.

This is the latest design with improved specs over the original.

Have fun. Total cost is about $50 based on my experience.

Original design here, but cannot be made anymore due to obsolete components.

https://www.eevblog.com/projects/ucurrent/