Building works making me chuckle..

[Kingstech]

Well you don't have to if you're using them internally, it really only applies to companies that need to prove their kit is accurate for certification purposes. For internal work you can stick a label on it that says "For indication only". Getting flukes calibrated can be very expensive so I'd only do it every 3 years for my own kit.

@truebluesteve thanks. We have had ours for about 3years I think. I will look into it and see how much it is.