Power-Z C240 Portable USB-C Tester, Digital Power Meter, Supports up to 240W and PD3.1 QC5.0, for USB-C Phones, Laptops, Chargers and More

Esta excelente

Handy to check how much power a USB device is consuming, but when combined with a wall adapter, this little thing can even be used to see if a wall outlet is able to pump out at least enough proper power for standard USB power (5V === 1A) if not more (since USB-C supports higher amounts of power) as well as just see how much power something like a power bank or my iPad can output. Really, it's just fun to test it out with different stuff to see what readings you get.

Actually I am returning a three pack of Anker branded (this shocks me) 20w chargers. They indicate the correct information for 5 and 9 volt. And will support the needed standard on 9v for 20w (2.22A). But no where does the package indicate 12V but guess what it does report it supports it but only at 1.25A. That is only 15w for any device that will support 12V like the iPad Pro. :-(Technically I don’t NEED this device but only bought it to be geeky…. :). But, it is easy to use and while I would have preferred to have its big brother I simply could not justify the added cost. This one is well within a price that allows someone to easily have it just because they want to.

The unit has a nice display, but that's where it ends. When plugged into a magsafe3 charge cable for my MacBook Pro and regardless of full charging near 140w (28v 5amp) or if idle not charging (28v .35 amps) the unit runs extremely hot. It's too hot, and the charger port and USBC connector heat up too.I own the km003c and it runs cool doing a lot more. When the magsafe3 cable is plugged it, it reports 1/2 to 1/3 the amps being consumed at idle and it does not get hot.I believe this unit likely stresses the magsafe3 cable logic and charger and potentially MBP, or it has very inefficient power management for it's internal use.I suspect this unit could be dangerous to anything connected through it and should not be for sale.

I only have one small gripe with this - it's SMALL. Maybe it's my eyes but don't expect to read the small print unless you have a magnifying glass, but outside of that it's plug and play.USB3/USB-C is wildly different than USB2 - and the plug type is now not just on chargers but on so many devices. Unfortunately the cable guys are allowed to sell cables lying about their specs, missing channels or features which in the end means you won't get the performance the cable claims to have. With this you can see if the cable even allows USB C charging, meaning does it have the wires between your charger and the device to charge, so the right power can be offered to fast charge. In most cases it's the cable - cheap cables are cheap for a reason; they may work great for you but don't blame the charger if it's slow.And this little device can tell if that's the case. It's not in the cheap end, but if USB C is what you do, it's where you should begin. I've seen other power-z units with similar features - not just on AMZ that may have better displays and additional cable verification features. This is the base model and works great.

This is about as simple as it gets. Plug the monitor inline with your device and see how much power you're using in watts, amps, and volts upto 240 watts (the current maximum). Cumulative energy delivered in watt hours is also displayed. This information can be used to verify that your cell phone is charging at its maximum rate, or that your power supply is providing enough power for your computer to charge. If the display is off, no power is present. Did you plug in your power supply? Is it broken? Is the cable good? These questions can be answered with this simple device. It comes in a nice tin box for easy storage and protection.

Works as described. However, it seems it is designed or ended up in a way where the screen it upside down when looking down at it. This oddity makes it a little less enjoyable to use, so one less star. This might be a concern for some.

Very cool little device lets you know how your chargers ACTUALLY perform, nevermind the claims on the box. It also shows you how well your device is taking a charge. I absolutely love this thing.