Here’s an open-source micro-ampmeter with autorange. It can measure current from 0.05μA to 10mA. It’s designed on a single layer PCB, making it easy to build with DIY etching techniques:
The micro-ampermeter described here is intended for experimenting with low-power devices. I have just a general multi-meter in my home lab, which is not very convenient to use. The reason for this is that now-days many electronic devices have a power saving mode, where their current consumption drops down in 1-3 orders of magnitude. Measuring current in a device that periodically enters a sleep mode makes it necessary to frequently adjust the multi-meter range, unless it is automatic.