Fafeicy RF Power Meter and RF Signal Detector - 65dB Dynamic Range Logarithmic Amplifier in Aluminum Alloy Housing DC 6-15V

Warning! Do not apply the specified 6V to 15V to this device. You will kill it! I'm on my 3rd one of these now, and that one is finally working and I'm very happy with it, but the first I received is dead having applied 12v to it after assuming that given the description says 'Power Supply Voltage: DC 6V-15V' (and this is also printed on the front of the device) that 12v would be fine and it must have some kind of voltage regulator in it to feed the AD8362 with it's required 5v. With the benefit of hindsight however I should of opened it up and checked, and if you do you see the voltage you apply goes straight to the chip which has a max input of 5.5v according to the AD8362 datasheet. Also beware that there is no external indication of which identical looking terminal is input or output and if you get those the wrong way round when you first connect it and also apply more than 5v at the same time you're going to both fry this device (which results in Vin appearing fully at the output) and maybe fry your RF device too if that was incorrectly connected to the unlabelled output instead of the input. For reference the input is on the left if the Vin pin is facing down/towards you. Don't rely on the sticker orientation as it was a different way up on each of the devices I tried. Suggest opening up the case to check. However, all the being said. If you ignore the seller instructions and pay close attention to the AD8362 datasheet to work out how to power, connect and use it correctly, then the chip itself is great and has the advantage over some of the other similar devices available on Amazon which use the lower spec'd AD8307 or AD8317 instead, that it also gives useful data from 0dbm to +10dbm, while the AD8307 and AD8317 top out at 0dbm max. Wait, I hear you ask. What happened to the 2nd device you tried? Well that actually turned out to be some kind of children's hair band with ribbons on it when I opened the package, which refused to measure RF power regardless of the voltage applied, and I couldn't find a spec sheet for it, so I had to send that back too. But that's all part of the fun of ordering from Chinese importers on Amazon!