Devices USB Charging USB meter


ChargeLab new product. USB power meter with up to PD 3.1 support

With higher voltage (50v) and current (6A)

The device is not PC Software compatible with KM001 KM001C. First versions of application was about 90% Chinese. With almost no English translation.

Power-Z Lab 2.0

(Update for 2022-04-05) But that is getting better. Version 1.2.8 is more usable with better English support

Power-Z Lab 2.0 v1.2.8

Despite the similar name, design is changed a lot since KM001C devices

Protocol MTK-PE is not detected by KM002C

Firmware 1.1.0 is unstable and has to be updated before using the device. Firmware update is possible for Power-Z Lab application.

Link to Dropbox from ChargeLab

air quality

Qingping CGS1

Qingping Air Detector (AKA ClearGrass Air Detector) is one of the best portable devices reviewed yet.

Impressive tech specs and design. Can be used both: as portable and not portable. And in a mixed way too. Good sensors for tvoc, t/rh, co2. High-resolution touch screen, Wi-Fi (that remember all Wi-Fi you were connected to), ambient light sensors, android and ios mobile app. And all that for a bit more than 100$ (incl. Delivery). For this price tag, it is a kind of flawless device. So the minor issues are not critical at all. Like it might have a different CO2 sensor (SenseAir S8 instead of Sensirion SDC30 for example) inside. But since S8 is not bad. It is still ok.


  • 1800 mAh battery (~4 hours of battery life)
  • Compact (9x9x7cm, 218g)
  • Calibration (tvoc, CO2) may be done manually
  • Correct t/RH and CO2 measurements
  • High resolution display with good viewangles
  • Touchscreen and good UI usablility
  • Keep multiple Wi-Fi AP settings
  • Weather and time sync from Internet
  • Ambient light sensor
  • Good thermal design and active airflow
  • Mobile App and 3-rd party app support
  • Wireless (OTA) update w/o app needed


  • CO2 high level is starting 2000ppm.
  • Disassemble is not trivial.
  • There might be other sensors inside.
  • No alarm clock (but should it be there?)

Device inside:

Device App:

Device Thermal:

Manufacturer link:

AliExpress price ~110$

air quality Devices

Protmex PTH-5

Yet another highly portable standalone CO2 Meter. This one with great battery life. One of the recommended devices. It is not absolutely flawless but is ok to buy. It got fast, accurate, and low power t/RH sensor (Sensirion SHTC3). Its CO2 sensor is kind of average (Cubic 1106 probably). Charging 5v 1A


  • 2400 mAh battery (~20 hours of battery life)
  • Small and relatively lightweight (8x3cm, 145g)
  • Calibration can be done manually
  • Correct t/RH during normal operation


  • Leading zero in CO2 display
  • CO2 measurements might sometimes be wrong
  • CO2 measurements delay is on power on
  • CO2 measurement interval is 16/4 sec (10 sec average)
  • t/RH measurements during charging is a bit incorrect
  • Display view angles are not perfect

Device inside

AliExpress Price: ~60$ (may change)


What is wrong with MagSafe Qi 15W

That is quite a long story of smartphone makers are trying to create powerful Qi charging devices. And usually, they are all fails. Wireless chargers are still noticeably slower than wired. And also less power-efficient. And also not reliable. With some previous wireless charging docks, you someday waking up with your phone not charged at all. And there are a couple of reasons for that. First is coils misalignment, which reduces all (speed, efficiency, and reliability). The second is power loss and related overheating (affects speed and efficiency). So what is good about Apple MagSafe 15W Qi charger. It solves the first issue. Coils are now aligned. So you can be more or less sure that you will get your phone charged. But it mostly ignores the second. Qi charger is still overheating. And that is slowing down the charging process. Yes, it is an aluminum body, and that is kind of good news. But that is definitely not enough. So for a period of 3-5 hours of wireless charging, you will get 15W only for a short period of time. Usually, it is about 5-7 minutes. And the most interesting part there is 7.5W charger may charge faster than the 15W charger just because of less initial overheating.

So the usual charging may look like graphs below

That is just about 4 hours. But results may vary a lot. That is highly dependent on temperature (room temperature, phone temperature, table temperature), on do you charge with a charger below or above the phone. Do you use a case or does the phone do some background tasks. Do your air moving in the room. It impacts Qi charging speed much more if compared to wired charging.

Wired charging from same 20W power adapter:

It is for the same conditions, same case, same temperature, same table. Just about twice faster. And power consumed is 14.5Wh instead of 22Wh to charge an iphone 10.78 Wh battery (while phone is on, but not in use). That is about 3 times more energy lost on generating heat.

So How to get 15W we pay for? That is easy :). You need to place the phone (without a case) in some cold place with airflow for at least the first 30 minutes of charging.

And if you got proper cooling you will get something like:

Still a bit worse than wire charging in the room. But anyway we got our 15W Qi. It exists and it is fast. (That is kind of sarcasm).

So what is wrong with Apple Magsafe Charger?

  • it is slow
  • it consumes more power
  • it is expensive

One more thing.. about power consumption. Idle power consumption is also might be an issue. Lightning cable inserted in 20W AC adapter consume much less power (0.0025W) in idle mode (when you do not charge anything) than MagSafe charger (0.34-0.5W). So if you kind of eco-friendly person you better plug out the MagSafe charger every time you are done with charging.


iOS CarPlay Navigation

As for the January 2020, there are 10 CarPlay enabled navigators available in Ukrainian AppStore. See twenty iOS Navigators 2020 comparison. That is about 50% of all. Some new applications were found since iOS Navigation 2016 comparison in November 2016. So trends are as following. Much more OpenStreetMap based application. Even apps with own maps (like Apple map) use or get some data from OSM. Free applications are in general better. So there is clear wikinomics at work. Maps and Traffic data quality are better with the mass collaboration approach. In 2020 there is almost no reason to use paid navigation and that is probably why most old-school “best in class” navigators like iGo are not in active development anymore. Also, there are fewer local apps on the market.

How to choose a navigation app for your region:

  • Map is actual (new streets, new buildings, etc)
  • Traffic information is available and good
  • The Map can be edited by users
  • Users are able to report traffic events
  • CarPlay and iPad support (if needed)
  • User Interface is good
  • Free or price is reasonable
  • Offline maps available


Best iOS navigation application for Kyiv right now.

  • The map is good and users able to edit it
  • Traffic is good and users are able to report road events
  • Both iPad and CarPlay are supported
  • Offline navigation available, but without offline search
  • UI is average

Google Maps

Alternative application. For those who do not like Waze.

  • The map is good, but only errors reporting for users
  • Traffic is good, but no events reporting
  • Ipad and CarPlay supported, but in 2D mode for CarPlay
  • Offline for some part of the map, not regions
  • UI is average

HudWay Go

Just to be mentioned for interesting design

  • Map is average
  • No traffic (and not free if available)
  • No iPad support
  • No Offline
  • But it is nice )
air quality


Dienmern DM601 is a portable air quality monitor with two options available DM601A and DM601B. The difference is in additional HCHO sensors. Model DM601A has no HCHO sensor onboard.

The device has SHT30 temperature and humidity sensor but measures temperature wrongly due to device self-heating and poor thermal design (see thermal photos of DM601A). The battery is 3000 mAh that gives about 5 hours of both charging time and battery life (see details).

Most of the sensors inside DM601 are unbranded. No Wireless connectivity. Usability is average. Measurements (except temperature) are more or less ok.

Aliexpress price: 70$-100$

air quality

Air Mentor 2s

Multi-sensor (CO2, PM2.5, TVOC, HCHO) air quality monitor with Bluetooth and Wi-Fi.

Applications are available for iPhone, iPad, Android phones.

Air Mentor 2 iPad application

By its design Air Mentor is not a portable IoT device. It has no battery. It has no display. So it is an alternative to uHoo (and to some extent to Netatmo). If compare Air Mentor 2s to uHoo: Air Mentor 2s have HCHO sensor. But uHoo measures CO, O3, NO2, pressure instead. Netatmo is actually a weather station with an external t/RH sensor, that also measures air quality by CO2 parameter only. Air Mentor 2s got a more expensive CO2 and t/RH sensors than both Netatmo and uHoo.

Temperature and Humidity sensor (SHT30) is both good itself and placed correctly on the bottom of the device with some gap from the mainboard. More or less as it is recommended by the Sensirion guide.

There are some issues with the current versions of mobile applications. For example, you cannot connect the device to Wi-Fi access points using iOS devices (it works using the Android version). Russian localization is not complete. Trend data from cloud not always loading (for both iOS and Android).

air quality

Hti HT-401 CO2 Meter

Hti HT-401 is the most portable CO2 meter I have. It is small and simple. It is only 75 mm in diameter and 25 mm in depth. Weight is 62 g. That is including 14250 (1/2AA) 300 mAh battery. Its only button is power. It count 30 seconds before actually show the CO2 level. And it automatically power off after 30 minutes.

HT-401 CO2 Meter

Four-digits LED display only shows CO2 level and 3 emoticons ?<600ppm ?600-1200ppm ?>1200. That is it. No settings for emoticons limits. No setting for the power-off timer. Not display temperature and humidity, nor time and date. Just one sensor inside and that is well known SenseAir S8 LP. That provides correct readings. Changing the environments not impact accuracy. The device is relatively cheap (I bought it for about 75$ without battery on Aliexpress)

USB meter

WITRN U2 USB Power meter

WEB-U2 or WITRN U2 is one of those advanced power meters with a big screen.

  • Both type-A and Type-C input/output.
  • Multiple display modes.
  • An external temperature sensor support.
  • The device has an auto screen rotation.
  • Fast charge protocols detection.
  • PC Software
power bank

Power banks with MTK-PE

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 BankInput, WQCPE+PDotherprice
Tqka KA05820W QC2.03.01.1details14$
Unitechi UTI01PD20W QC2.$
rock space P6518W QC2.$

All fast charging protocols that can be detected by WITRN U2

Power bank/protocolTqka KA058Unitechi 01PDrock space P65
USB Power Delivery (18W)PD3.0PD 2.0
Apple 5v, 2.4A+++
Samsung 5v, 2.0A+++
USB Battery Charge 5v, 1.5A+++
VIVO Dual Flash 5v,9v,12v +++
QC2.0 5v,9v,12v+++
Samsung AFC, 9v+
Huawei FCP 5v,9v,12v+++
Huawei SCP
Mediatek PumpExpress+PE+1.1PE+2.0PE+2.0

Tqka KA058 Apple 5v 2.4A