I did considerable research on power supplies before I purchased this product. I have not been disappointed and it seems very well made and solid. Also, I looked on their website and they make professional power supplies and other equipment. Power supply is well within spec. After testing with two different volt meters and finding both read the same, and the power supply itself display was only off by .01 volt, (one thousandths of a volt) from the test meters. That seems very good to me. I selected a linear power supply as the output is usually more stable than a switching supply. So I feel confident I can connect this power supply to delicate electronics without damage. I would recommend this power supply or other products by Tekpower.

Awesome regulated power supply at a great price. I haven't pushed this to the levels where other reviews state that the noise from the fan is a nuisance, so I can't confirm that. It's as silent as can be at the 21V 0.6A that I am using it for at the moment.
I've had nothing but good experiences with the safety features for current or voltage control.
My only issue has been with forgetting how the controls default to changing the most significant digit when rotated.
You have to be careful to toggle to the digit that you wish to change before just simply spinning the knobs.

I've accidentally cranked the voltage up by ten VDC more than once because of this oversight.

It's something that you can train yourself to avoid, however it's a very easy mistake to make with these controls.

This is an INITIAL review since I have only used the power supply for a total of about 10 hours over the last few months. My initial impression is that it has excellent build quality on the exterior (I haven't opened up the unit to see the internal layout, and I ..the buttons and controls feel very good, and the display is clear and bright. Testing against my Fluke 75 (which has a NIST calibration), my unit was voltage and current accurate to better than .1 percent. I only had the application to exercise low current, but it seems to shift automatically (and relatively quietly) into higher current modes.

Overall I'm VERY impressed at this price point ($80 dollars). If the unit lasts, and for most bench testing applications that don't require micro-volt precision, I don't know another product that is better.

Had it for a couple weeks so far. Seems robust and works well. All of the major functions perform as expected. Build quality seems good. For several reasons, I would love to give it 5 stars.

However, as others have mentioned, there are some frustrating design flaws that make it dangerous to use without taking special precautions.

Issue #1. It is FAR too easy to accidentally add 10 volts to the output! I have already destroyed a 5v circuit by accidentally raising the voltage to 15v with one accidental push and twist of the voltage adjustment knob. This is because after power-up, the default unit of voltage change is 10 volts! Changing adjustment units (10v to 1v to .1v to .01v) requires repeated knob pushes WITHOUT rotation. However, this design makes it far too easy to accidentally increase the voltage by 10v (e.g. from 5v to 15v) by pushing the knob and simultaneously accidentally rotating it one click to the right ... POOF!, your 5v circuit goes up in smoke. I've already made this fatal mistake once in just a few hours of use. Thankfully it wasn't a costly circuit to replace.

Recommendation 1 to Tekpower: Change the default voltage increment unit on power-up from 10v to .1v!! This simple change means that an accidental push and twist of the knob only changes the voltage by a small amount.

Recommendation 2: Outright ELIMINATE the ability to change the voltage by units of 10v! Rotating the knob through 30 steps to go from zero to 30v seems completely acceptable given the alternative.

Issue #2. It does not remember important settings across power cycles. It does remember last voltage and current settings, but Issue #1 would be somewhat mitigated if it remembered I was adjusting in .1v units across power cycles. And, as others have said, the Settings Lock is lost across power cycles as well.

Recommendation 3: Remember crucial options like the voltage adjust units and Settings Lock across power cycles.

Issues #3. There is no Output On/Off switch! Issues #1 and #2 would be somewhat mitigated if there were an Output On/Off switch to easily disconnect the supply from the circuit before making ANY setting changes.

Recommendation 4: Add an Output On/Off switch. Personally, I am willing to sacrifice the Ground connector for an Output On/off switch. I opened the unit to see if I could add a switch myself, but it'd be difficult given the main logic board encompasses almost the entire front panel.

Issue #4. Issues #1, #2 and #3 conspire to make a bad situation worse. Because of the lack of an Output switch, one might use the main Power On/Off switch to cycle power. This not only potentially subjects the circuit to voltage spikes, but it resets crucial settings like the voltage adjustment unit back to 10v.

The only real workaround for these flaws is to manually unplug the positive banana plug before making any changes and then replug it in only after ASSURING the new settings are correct.

It is frustrating that what is seemingly a robust and well-built power supply is dangerous to use in real world situations because of some basic human interface design flaws.

This thing is built like a tank. It's good at being what it is--a simple power supply. The readings on the screen don't lie if checked against a multimeter, it's built like a tank, and it has good short protection. It took me a second to realize that I needed to press the knobs to change the values, but once that was figured out, it took less than two minutes to get up and running with this thing.