Let's begin by familiarizing ourselves with the main components needed for this project: the ESP8266 ESP-07 module and the capacitive soil moisture sensor. The ESP-07 is a versatile, Wi-Fi-capable module based on the ESP8266 chip, ideal for IoT projects due to its compact size and low ...
Sometimes a meter came with a set of shunts for measuring different currents. See links. A completely different way to measure currents is to use a hall effect sensor. Links to More information: Scienceshareware.com's How A Precision Resistor Is Used to Measure / Calculate Current and ...