Review on High-Performance Large-Screen Digital Multimeter - Voltage Resistances Currents Transistors (hFE) Square Wave Output Diode & Audible Continuity Tester with Buzzer by Rail Basri

Will make a great $9 helper for any toolbox or truck. No excuses. The display is very large and easy to read and has all the standard functions and more. I haven't used a square wave generator and it's nice to have one that will probably never be used, so yeah I really don't care if it's not a perfect 5vpp square wave. I can't say much about the accuracy, that's not why I bought it. However I can tell you what 1mV on a 20V scale is worth from commercial electrics see fig. The wires are interchangeable and standard size which is a plus for this price point. Buy it and you won't regret it.