This is a passive electronic load where you can set the ohm value and measure current, voltage and watts on both RMS AC and DC power. All the data can be read on the small OLED display on the right side. I will describe it in more details when I get time for it.
Here is a test of the load on an early version without the electronic switch board. Back then, banana lines were used to set up the resistance value. Here it is set up to 0.5 ohms and 26 volts DC input. I measured the current by measuring the voltage on one of the resistors and then used ohms law, approx. 52 amps.
Thomas Uhd Larsen - tl@tltech.dk - www.tltech.dk - www.techduck.dk