Digital Ammeter--Looking for Source

[npalen]

Looking for a digital ammeter for my tractor that reads negative as well as positive amps. The digital ones I've seen only register the amps in one direction. Any help?

 

[k0ua]

DC -1A Digital Positive Negative Current AMP Meter Backlight ON/OFF Blue LCD | eBay

Maybe this?

 

[npalen]

That should do the trick! Thanks for posting.
Thinking about ways to provide the external power supply: Wonder how long a 9 VDC battery would last given the Power consumption: <= 20mA?
Perhaps a way of switching the 9VDC off when ignition switch is off. Or spend a few dollars and get a DC to DC isolater?

 

[k0ua]

That should do the trick! Thanks for posting.
Thinking about ways to provide the external power supply: Wonder how long a 9 VDC battery would last given the Power consumption: <= 20mA?
Perhaps a way of switching the 9VDC off when ignition switch is off. Or spend a few dollars and get a DC to DC isolater?

The 9 volt battery would be a pain.. Always dead when you need it.. I would keep looking for one that did not need an isolated power supply. Or you could do the isolated power supply thing I guess.

 

[npalen]

Duplicate post

 

[npalen]

duplicate post

 

[npalen]

Isolated Power Module DC-DC Converter In 1-16V Out 12V | eBay
DC -1A Digital Positive Negative Current AMP Meter Backlight ON/OFF Blue LCD | eBay

I noticed that the seller is now offering an isolated 12VDC power supply to use with the digital amp meter.