Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best-selling in Other Test Meters & Detectors
Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Save on Other Test Meters & Detectors
Good quality, simple to operate USB voltage / current / capacity / charge time measurement device. For my use it would be better if charge or time measurement would be replaced with power, but still very fine device. It can measure 4-20V nad current up to 3A, so it's more than simple USB charger with limit 5V/1A.
Verified purchase: Yes | Condition: New
Bought this to monitor the USB output of a solar panel. First problem was that if the current dropped below around 200mA, the counter stopped counting mAh, and didn't start again even after the current increased. To get it counting mAh hours again, I have to disconnect and press the reset button several times. Second problem was when I noticed that it was saying the output of my solar panel in full sun was only about 220mA, when weeks earlier (in weaker sun) it had been showing 500mA. Today I've cut a USB extension cable and connected my professional ammeter in series with this device. My ammeter said the current was 295mA, yet when this device was removed from the series (leaving just the ammeter) the current went up to 459mA. So as well as not counting mAh properly, the device also seems to reduce the current by 33%, which is obviously not good when you are trying to charge devices with limited solar power! Disappointing.Read full review
Verified purchase: Yes | Condition: New
Took ages to arrive, but well worth the wait - this thing is fantastic! It's very well made and works exactly as advertised and already helping me diagnose problems with IoT devices I'm working with (great for checking if they are going in to sleep mode properly)! No idea how they get the price so low for such a marvellous product.
Verified purchase: Yes | Condition: New
Works well give a good reading of power in and out exactly what I wanted from this product thanks
Verified purchase: Yes | Condition: New
Much better than the basic ones that only measure instantaneous voltage and current, this gives those two measurements and adds uptime and capacity in milliamp hours. It keeps these last two measurements after unplugging with a reset button to clear. I haven't tested for accuracy but seems believable.
Verified purchase: Yes | Condition: New