That equipt/NL monitor is an awful lot for a glorified low resolution volt meter. You can either get a much nicer and more useful voltmeter for about the same price:
https://www.amazon.com/Blue-Sea-Sys...qid=1516240921&sr=8-2&keywords=oled+voltmeter
Or a much cheaper unit:
https://www.amazon.com/MICTUNING-Di...TF8&qid=1516241147&sr=1-12&keywords=voltmeter
Don't be suckered by 'exposexuality'.
https://www.amazon.com/Blue-Sea-Sys...qid=1516240921&sr=8-2&keywords=oled+voltmeter
Or a much cheaper unit:
https://www.amazon.com/MICTUNING-Di...TF8&qid=1516241147&sr=1-12&keywords=voltmeter
Don't be suckered by 'exposexuality'.