The rear panel has two screws at the lower edge probably for disassembly, a flip out support leg, something like often found on the back of picture frames to hold them up on a slight angle. I do not find this satisfactory but I suppose optically enabled people would be happy enough to hold it more easily visible. I hope this helps satisfy some of your curiosity.
To remove this, a screw is released from the lower edge of this cover, located between the two upper hinges of the support stand. There is a slot at the top of the cover to pry it off with. Of more interest is the front panel. The lower mounting for the meter is rounded, a little like a smile I suppose with three buttons quite flush mounted around this curve. It seems to have something to do with calibrating capacitor readings. Press and rotate it and continuous talking is enabled where the reading is continuously repeated at about two second intervals until this feature is disabled. It is recessed in the centre with a bar to grasp to turn for selection of the various options.
On my model the bar is set horizontally when the switch is to the far left or counter clockwise position, the off position. The active probe differs from the other one in that there is a small button on it which will, if pressed and released within about a second and a half will cause the meter reading displayed to be spoken. The engineers at work thought they might buy one for the Hospital for calibrating our emergency generator. Apparently dedicated frequency meters cost around three hundred dollars.
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