The UM34C was sent to me by RD Official Store in AliExpress for review.
Here's the product's page: RD TC66C
Manufacturer Specifications:
Model: | TC66/TC66-C | Display screen： | 0.96 Inch color IPS display | |
Voltage measurement range: | 0.005V-30.0000V |
| 0.0001V(0.1mV) | |
Current measurement range: | 0-5.00000A |
| 0.00001A(0.01mA) | |
Supply voltage: | 3.5-24V |
| 160*80 | |
Capacity accumulation range: | 0-99999mAh |
| ±(0.5‰+20digits at 23℃) | |
Energy accumulation range: | 0-99999mWh 999.99Wh | Current measurement accuracy: | ±(1‰+30 digits, at 23℃) | |
Load impedance range: | 1Ω-9999.9Ω | Power measurement range: | 0-150W | |
Temperature measurement range: | 0℃~80℃/32℉~176℉ | Refresh rate: | 2Hz | |
Working temperature range: | 0~45℃/32℉~113℉ | Auto screen off time: | 0-9mins | |
Dimensions： | 49mmx22mmx8mm | Product weight: | about 8g (about package 22g) | |
Quick charge recognition mode： | QC2.0、QC3.0、APPLE 2.4A/2.1A/ 1A/0.5A、Android DCP、SAMSUN | |||
The USB meter arrived in simple plastic box.
The device itself is seated into foam, while no accessories are included in the box.
The device is made out of glossy plastic and it feels quite sturdy.
As seen, the meter arrived with a plastic protector for the Type-C port.
As you can guess from the title, the TC66 is using a Type-C port for its output terminal.
And same story with the input side.
On the left side of the device, there is a regular MicroUSB port which is used for connecting the meter to your PC
using the software provided by the manufacturer.
(Unfortunately, I don't have any Windows installation anywhere near me, so I wasn't able to test the software)
On the right side, one finds two control buttons along with two switches.
The switches are used to toggle on/off Power and PD charging.
Here's the device's circuitry.
The 0.96 inch screen panel.
And a picture with the TC66C fully taken apart.
Using the control buttons, the user can scroll through the available interfaces.
The main screen provides the following info:
Voltage (V), Amperage(A), Energy (mAh, mWh), Resistance (Ω), Power (W), Temperature (C) and Data Group.
Screen No.2 is about data recording.
It displays the following:
Recording Indicator, Data capture interval ( 01S), Data Reset (CE), Storage left for recording (00%)
Screen No.3 shows info about the charging mode.
It displays data line Voltage (+V, -V) as well as the current charging mode (DCP1.5A)
(Note: The shadowed numbers captured are due to the display's quick refresh rate - not visible in real life)
Screen no.4 is about detecting the charging modes supported by the charger.
In order to use the feature, it's important to use a capable electronic load. I don't know what might happen to your phone if
QC 3.0 is engaged while your charging IC can't handle > 5V 
Screen no.5 allows the user to manually trigger the desired charging mode.
The supported modes are: QC2.0, QC3.0, Huawei FCP, Huawei SCP, Samsung AFC and PD2.0
The last screen is about configuring the settings of the device.
The user can tweak the following settings:
Timeout Timer, Screen Brightness, Temperature Unit, PC Comminication On/Off, Bluetooth On/Off, Screen Orientation,
CC Line Mode, Language
Using the manufacturer's application, the device can be connected to your Android device.
Here's how the UI of the application looks like.
All in all, I think the TC66C is an excellent USB meter.
Specs aside, the one single feature that amazed me is its ultra-fast (for such a device) sampling rate.
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