Does this measure reverse current? eg, will it show if a device (phone, i-pad, etc) is discharging into a "charger"?
322393
I doubt it very much. The meter requires power from the USB charge port. If you removed the power from the charge port to see if there is a discharge, the meter would not be powered. Your best option would be to modify a USB cable and connect in a milli-ammeter
1627408
Check if the source of 12v positive and negative of the monitor and the camera when you put reverse are reading the adequate current simustaniosly.
179948
Your "device" shouldn't allow the reverse flow.... ie your phone or tablet is allowing it's battery to charge other devices! Not sure this is an issue with the device I don't have the issue and the sCharger for me actually does what it says on the tin and very well!
1159792
That depends entirely on your car. The outlet in your car determines whether power goes to the device or not. Not the device.
552704
It's plugged into the power source, so my answer is yes. It's using power also so I don't know if you would notice it charging, but I can say I've used it when I had no power on my battery and it worked perfectly. I never noticed a drain on it either. It's like using the tablet while charging it. I hope this helps! :-)
1289944
We generally just use multimeters and/or Hydrometers to check batteries, I don't think this has that capability.It's great for charging though.
266089
No it doesn't. The only way you would know it's working is by plugging in your phone and see if it starts charging.
1890989
Hi, I just tried charging two Galaxy S4 phones with this device. They are displaying a charging status. What I don't know for sure is what charge current they're drawing. If there's a way to get the phone to tell me that, let me know and I'll check (yeah I could cut the cable and put an ammeter on it, but I'm not quite that curious...).
978308
Mine does. My issue is that it doesn't indicate "charged" - just keeps charging until you unplug it.
1116170
I tried to use it to measure the current on a Dell Venue 11 Pro, using the OEM charger, which should put out more than 2A. The display read 0.00 for a few seconds, then there was a spark inside the unit. After that it reads 0.00 for any load. The voltage side of it still works, but the Amp circuitry is fried. You may get lucky like the previous answerer, but if you want to regularly check tablet charging, you might want to look at another device. Other than that, great product and definitely works as advertised!
168594
It shows that the power is successfully connected. It goes out but never lets you know when fully charged. Sorry, I just let it go for a few hours.
958961
Not really, unless you consider that to get it to light up, there is a minimal current draw while the unit is lighted up. When you unplug, there is no current draw. It really doesn't "Test" to get an accurate reading. It just shows what the battery reading is.
2194040
It's simple math. It all depends on how much your device draws. It will charge while powering a device but the net effect will be either negative or positive depending on light level and power draw.
456386
Check polarity with a small DC voltmeter or multimeter. When the + (usually red) lead is connected to the positive side of the battery, the meter will register a voltage reading. If the leads are reversed, the needle will try to deflect backward.
1493681
You would need to know how the ammeter circuit of your charger. This meter needs to be in series with load.
2145366
If I understand your question, you could look on the back or the bottom of the device where there is usually a label that lists how much power it uses. Also the transformer/power block that you plug in to charge the device will show how much power it draws. I hope this helps.
159662
My iPad 2 charges fine. According to Wikipedia, iDevices charge like this: "When D+ = D&#8722; = 2.0 V, the device may pull up to 500 mA. When D+ = 2.0 V and D&#8722; = 2.8 V, the device may pull up to 1 A of current. When D+ = 2.8 V and D&#8722; = 2.0 V, the device may pull up to 2 A of current." I measured my USB charger just now (purchased a few months ago) and I got these values in order: 5 V , 2.8 V, 2.0 V, 0 V. This corresponds to D- (pin 2) = 2.8 V and D+ (pin 3) = 2.0 V. This means an iDevice would limit its pull to 1 A. The problem with this is that it follows Apple's method of telling a device how much power is available. So other phone/tablets may not know how much is available and will only pull 500 mA. For my phone, I purchased a special USB charging cable which shorts the D+ and D- pins on the phone side (NOT the charger side). This tells my phone that it can pull more than 500 mA. Using this method, I'm not sure how the phone knows if it can pull 900 mA, 1 A, 1.5 A, or 2 A.