Instrument checks, but somehow insufficient results

Good day, I give out my review from.
So, to the unit to work with me, so: All cables are connected and the voltages are displayed if the power supply is functioning or not.
Now I have purchased the unit explicitly for exactly 1 power supply, there is a BeQuiet power supply, which unfortunately got wet through my carelessness, by cooling water from my water cooling circuit.
Of course, the power supply did not go for it, but I let it dry, even several weeks, even months, after I've had bought spare because I did not think that the power supply ever working again.
But I wanted to test it, so this device was used here.

The result is unsatisfactory and insufficient. Here are "only" displayed the tensions, ie 12 volts, 5 volts and 3.3 volts. Just as in itself can not do anything with the values, it simply lacks the load.
Now I know so if quasi bears no load, the power supply can supply the voltage that is sufficient for the operation of a computer ... yes. And further? Seeking actually a device that tells me: the AC adapter is 100% ok or not. And something has not the device.
Of course not, at least not at the price, but I would imagine that people use the device here and just exactly think so "cool, my power supply is perfectly okay" etc. But just can not be found here.

Well, I digress. The device is so marked as tester, so does basically nothing more than a voltmeter. More not. But there are several values ​​are just displayed at once, which is positive. Otherwise, it does not offer anything.

Conclusion: Well, I know it Erlich said no. To see if the voltages are held at least in IDLE, the device is good for sure, but for a true test of the power supply, it is entirely inappropriate!