are you not getting mixed up with pre testing your meter against a known source to make sure it is working before testing for dead voltage,just a thought not a dig btw
usual suspects giving tex a hard time because of their own agenda again,not so long ago Adrian was a hero now he's gone to zero,poor treatment of a man who gives up his own time to help the users of his kit and has went out of his way along with his tech team to resolve problems brought up...imo
i can tell you what it's called, load of sheeite ,worthless bit of paper..if any industry has been deskilled as much as the spark one I've yet to see it..