Digital voltmeter ammeter dsn-vc288 with aliexpress for 100V, 10A. The video shows in detail the wiring diagram, the calibration of the voltage and current. A small modification of the voltmeter is also shown in case the current is constantly overstated. After calibration and refinement, the device shows quite accurately. For the connection, two connectors are supplied, the first with two wires is used to connect an ammeter, the second with three thin ones - for powering the circuit and the display as well as measuring the voltage. In some versions, instead of the yellow wire - white, it performs the same function.
Such a voltmeter ammeter is often used to assemble a laboratory power unit on Chinese modules, sometimes put on car and other charges. For embedding into the case, the device has special plastic latches.
Buy voltammeter on aliexpress: http://ali.pub/351ojj
With free shipping: http://ali.pub/351olv
Join the VK group: https://vk.com/buychinaproduct