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Missing something...
But here's the stranger thing... Shouldn't it have more wires attached?
If this is a general purpose voltmeter - It should have two wires going to a power supply and two wires going to the device that is being measured. That's four. OK it could be using a could be a common ground - that would bring the count down to three, but the photos show only two wires
I suspect that this is really an automotive battery tester. It uses the input voltage as a supply to light the LEDs and displays that voltage (that's why it is rated with a minimum of 4.5 volts - it needs that to run the device)
this is really an automotive battery tester
Isn't that about as relevant as saying it's for Arduino? Sure it could be used for those purposes, but why call it that?
http://club.dx.com/forums/forums.dx/threadid.1302005
You can give it any use you want, not specifically Arduino or as a battery tester. In my case, I bought 2 of these to use in Arduino projects!
Creativity is the limit.
up BBSs.
Yes! And I do like how the cost of little volt meters like this is not particularly limiting, although I note that this is not the cheapest or smallest or most versatile voltmeter on DX.
http://club.dx.com/forums/forums.dx/threadid.1302005
But yeah at that price you can find a "830B" style meter for 5 bucks and hack it into somewhere, the only thing bothering me is the size a 830B will pose
But, heck.
http://club.dx.com/forums/forums.dx/threadid.1302005
Not on DX though, where do you live sheep?
AFAIK, voltmeters should have (ideally) infinite resistance. This one has very low resistance.
An used 9V battery that my bench multimeter reads as 8.43V, this one reads 6.2 volts.
I got in total 8 of these voltmeters from DX, in a total of 4 different models. No 2 of them can give similar readings for the same battery, and the readings vary from 5.9V to 7.4V. Besides, all of them have low resistance.
Most of them have an IC whose identification has been erased, so it's hard to tell if its a PIC, a current sensor or a voltage sensor doing the readings.
up BBSs.
Analog multimeters are pretty low impedance too
Anyway, you're supposed to bodge them into a circuit, not a battery