During Deep Sleep, microcontrollers consume very low currents, and batteries live longer. Unfortunately is not easy to measure these small currents. Today we will check out two small boxes which promise to make this possible. And we will use the 10’000$ professional Keysight N6705C Power Analyzer to establish the reference. The first contender is the well known µCurrent Gold which is made by Dave Jones from EEVblog. It is the “mother” of this device category and costs around 80$. The other is called Current Ranger and is built by Felix Rusu from Low Power Lab. It just entered the market and is an extension of Dave’s concept and costs around 120$. And we will use an ESP32 to check it out. Links: µCurrent Gold: https://www.eevblog.com/product/ucurrentgold/ Current Ranger: https://lowpowerlab.com/guide/currentranger/ Keysight N6705C: https://www.keysight.com/en/pd-2747858-pn-N6705C/dc-power-analyzer-modular-600-w-4-slots Keysight Partner: https://www.ccontrols.net/ USB isolator: http://s.click.aliexpress.com/e/cePppVMk Supporting Material and Blog Page: http://www.sensorsiot.org/ Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess My Bitcoin address: 19FSmqbBzb5zsYB1d8Bq4KbxVmezToDNTV If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission (of your purchases the next 24 hours) to buy new stuff for the channel For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to Email me or invite me on LinkedIn. These communication channels are reserved for my primary job #LowPower #IOT