liutyi.infoWEB-U2 or WITRN U2 is one of those advanced power meters with a big screen.
Since USB 2.0 became a standard for charging port there are a couple of things happens. Devices got more and more battery capacity and that is why many fast charging protocols appear to overcome USB 2.0 default 2.5W (5v 0.5A). Those protocols were necessary to keep the same charging time with larger batteries. Some of those protocols were part of USB standard (like USB Battery Charging and USB Power Delivery) and some were not (like Apple 2.4A, Qualcomm QuickCharge, Mediatek PumpExpress+, and a lot of others).
Most chargers and power banks support only some of those fast charging protocols. So usually you will not get the fastest posible charging for all of your devices from the same source. For example power banks with Mediatek PumpExpress support is exceptionally rare devices. There are a number of power banks with Qualcomm Quick Charge or USB Power Delivery available, but not with Mediatek PE+. So below is three 10000 mAh power banks I found with MTK-PE support.
| Power Bank | Input, W | QC | PE+ | PD | other | price |
| Tqka KA058 | 20W QC2.0 | 3.0 | 1.1 | – | details | |
| Unitechi UTI01PD | 20W QC2.0 | 3.0 | 2.0 | 3.0 | details | 40$ |
| rock space P65 | 18W QC2.0 | 3.0 | 2.0 | 2.0 | details | 20$ |
All fast charging protocols that can be detected by WITRN U2
| Power bank/protocol | Tqka KA058 | Unitechi 01PD | rock space P65 |
| USB Power Delivery (18W) | – | PD3.0 | PD 2.0 |
| Apple 5v, 2.4A | + | + | + |
| Samsung 5v, 2.0A | + | + | + |
| USB Battery Charge 5v, 1.5A | + | + | + |
| OPPO VOOC, DASH | – | – | – |
| VIVO Dual Flash 5v,9v,12v | + | + | + |
| QC2.0 5v,9v,12v | + | + | + |
| QC3.0 | + | + | + |
| Samsung AFC, 9v | + | – | – |
| Huawei FCP 5v,9v,12v | + | + | + |
| Huawei SCP | – | – | – |
| PE+1.1 | PE+2.0 | PE+2.0 |
Power-Z KM001C is USB Type-C tester from ChargerLAB. Nice and slim. With OLED display. With good PC Software. Have similar features to KM001 and same PC Software.
The main issue of Power-Z devices is no good English translation for both firmware and PC Software, But anyway it still a useful tool. And PC Software is actually best in class. Software updates are available at
This time OCRKJ D9-H. Which also can be found in some shops as unbranded LCD Digital Air Quality Monitor (AKA
It looks like relatively cheap SHT20 temperature and humidity sensor inside make it sort of a lottery if you will get correct measurements or not.
See device insides: https://wiki.liutyi.info/display/CO2/D9+Inside
SALE Price was: 102$
I was not expecting much ordering KKMOON K6 (and receiving actually OCRKJ K6). Which also known as CAFU K6. Because most of the portable air quality monitors I got before have at least one major issue with measurements (AiRead M3 – all measurements wrong, HT-501 – wrong temperature, AirRadio A6 – issues with CO2 measurement after outdoor use and wrong humidity measurements). AirVisual Node was the only exception that both portable and show correct numbers. But it just too big to put it in your pocket. So there was a long history of portable CO2 monitors with issues. And it was kind of a surprise that the device I bought for 83$ is both portable and displays more or less correct numbers.
See device insides: https://wiki.liutyi.info/display/CO2/K6+Inside
Price: ~100$ (sale price was 83$)
In the future fast charging might get some common ports and protocols. And it seems it will be type-c with USB Power Delivery in use in most cases. But for the moment it is several standards that provide more power than a standard USB port. Those standards are mostly not part of USB specification. And it is kind of unusual to have charger or power bank that support multiple fast charge protocols for different devices. That cause slower charging of some phones using charger or power bank designed for another. For example, at the moment most Qualcomm and Mediatek based Android smartphones have different fast charging standards. It took some time for me to find MTK-PE+QC3.0+Apple2.4 charger and power bank.
So the power bank is Tqka BA058
Awair 2-nd edition is a better version of Awair, that fix some known issues of first edition
SeekThermal CompactPro (300~500$ on Amazon) is an accessory that allows you to shot thermal photos or videos. Available for Android and iOS devices
Example video (time lapse done in an external application)
Umidigi Q1. 15 Watt Qi charger for Umidigi Z2 Pro (that is not yet released). It should also charge iPhones with 7.5W max.
Apple iPhone X charging time:
| 50% | 80% | 100% | |
| PC Port USB 2.0 | 03:00:00 | 04:40:00 | 06:10:00 |
| Umidigi Q1 | 01:28:00 | 02:28:00 | 03:34:00 |
| Apple 5W charger | 01:25:00 | 02:05:00 | 03:25:00 |
| Umidigi Q1 + extra fan | 00:55:00 | 01:48:00 | 02:40:00 |
| Apple 12W charger | 00:35:00 | 01:05:00 | 02:10:00 |
| Apple 29W charger | 00:30:00 | 00:55:00 | 01:55:00 |
Charge in case without extra cooling
Charge with no case and with additional external cooling
Portable CO2 meter and data logger with battery and good CO2 sensor inside.
The only really wrong thing about this device is it always show temperature higher than it is for about 2°C (for example 28.0°C instead of 26.0°C) and it is not something related to wrong sensor placement.