I bought this to use as a Peltier (thermoelectric cooler) controller. I was using the peltier modules in an experiment to cool my CPU. It worked and controlled the voltages perfectly.
It measures the amps, watts, and volts accurately. It handles a 6 amp load just fine.
The components and soldering seem of very good quality.

The heatsink comes uninstalled. It fits onto the PCB with a double-sided thermo-tape. The chips (that get hot) are on the other side of the PCB. On the backside. It's not the most efficient way to cool them.
I would recommend to the manufacturer; find a way to attach the heatsink directly to the chips.
It in no way affected the performance of this unit though.

I use and love many of the DROK products – but have one concern about this Buck Boost Converter Display item – Amazon Part Number: 2001711006 (hereto referred to as the Buck converter). There is no way to calibrate the display! And - both the “Voltage In” and the “Current Out” display values are off. Also note – while the current meter has 0.xxx (1 milliamp level) digits in the display – I found that adjusting the cc pot provided 5 mA jumps in current control and resolution. I could not control the current down to 1 mA resolution. This is probably not an issue for most applications – but just something to know.

To test the meter display accuracy - I powered the Buck converter with a stable DC power supply set at 9V. This was connected directly into the Buck Converter. I had the CC on the Buck converter turned up – so there was no current limiting. The Buck converter output was set at 10 Volts. Then I connected the Buck converter output thru an external panel gauge (a DROK 0.28"High Accuracy DC 0-33.00V/0-999.9mA-3.000A 12V Voltmeter Ammeter Voltage Current Tester Monitor Panel Gauges – Amazon Part # 300006). I have several of these gauges and they are all dead on accurate. (Hereto referred to as the panel gauge)

Then I connected to the output of the panel gauge to a 100 Ohm – 5 watt resistor.

When I select the “Input voltage/output current” measurement on the Buck converter it read 8.9 V (rather than the 9V). And the output current read 85 mA. However – the Voltage Current Tester Panel Gauge read 102.5 mA; which was expected and correct.

When I select the “output voltage/output current” display option on the buck converter; the current reading remained at 85mA (as expected) and the output voltage read 10.09 (which is accurate).

So – the input voltage reading was not that far off – but had nowhere near the accuracy of the DROK panel gauge device . And the output current reading was just wrong !!

I contacted DROK to see if there is any way to adjust this? Or is this device just not designed to measure that accurately? They responded: “Dear customer, Thanks for your message. We are sorry it can't be calibrated. The display for this power module can't be precise as multimeter or other meters. There will be error on measurement. Sorry for inconvenience may cause. If there are any more questions, please kindly let us know. Best regards, DROK.”

nice product no problem including it into my project. Thank you

I love drok products, and think the company is great. They are definitely on the way up and ill support them the whole way. Such cool products, some of which i just buy and find a project for em just to tinker with their great gadgets. Thanks

Quality item. Will buy again! :-)