Useful cheap small tester...

[Nick]

...Here's my proof, my old Avo analogue meter still works, I have never had to repair it, my cheap tat DVM packed up, there is little chance of repairing it so on that basis my Avo is infinitely more accurate than my cheap tat DVM.

Using that reducto ad absurdum logic, my old watch that stopped 2 years ago is more accurate than the very best atomic cesium fountain national physics laboratory reference clocks... twice a day