Voltage meter is accurate (as far as a simple analog meter goes) - double checked it with lab-grade voltmeter. Output A.C. waveform is stable under maximum-recommended full load - verified with oscilloscope. It is, after all, just a transformer coil with a wiper arm. Seems beefy enough. Haven't over-maxed it to see if fuse blows. They supply several extra fuses, so I assume it has been an issue. Would buy again, if needed, but I'd probably go with the digital metered version instead, although that digital version seems priced too much higher for the mere addition of a simple voltage readout.