If this is true, it doesn't currently help me with my meter issues. Last night I managed to get a few reading again, but they were all lower than 100, and never the same even when retesting without changing anything. Some time 60 kHz, sometimes 20 Hz, various reading in between. I think the meter is useless.
I've never tinkered with stuff like this, but if I had a working method for measuring frequency, I would have discovered that on my own pretty quickly. Every reading I got from the RS meter is suspect! I'm going to ask around as to where I can use an oscilloscope.