You can get plastered while you're using it.

I used this tool every day for 30 years 

Struth!, they are an expensive tool Bloodog.

 not expensive when they do the job for you, just think how many corners in a room, rooms in a house, houses in a week over 30 years  

The silver liquid in the glass bowl appears to be mercury and disappears into the handle if turned upright. There are no “undo able” sections. ??????

What happens if you undo the two screws just above the glass sphere?

I remember when you posted this item before. Looks like some sort of scientific tool.

But we all know what happened to thought !

Do you still have this thing Ratbob?  If you dismantle it as far as possible it might help to explain things.

Good onya Bloo.

I just asked the question on a well frequented world wide forum too.

Will let you guys know if someone knows what it is.

Someone on another forum came up with this Ratrob.

Looks like the same device, I have not digested the text yet though.

Yes, that item is a float switch. It would have been anchored in the bottom of a tank and as the level rose the switch would invert and contact would be made over terminals in the head of the float.

Much like the angle switch here.

Veeeery Well done FC.

Piccardi’s experiments also made full use of special water-structuring device known as a scale-buoy. This device consists of a blob of mercury enclosed within a glass bulb, with a partial evacuation of the atmosphere – several examples are shown in Figure 19. When shaken, this bulb will show a subtle blue-green flash of light. According to a literature review assembled by Faigl (1990) the scale-buoy will emit radio frequencies in the 6-9 Mhz range, with an attendant crumbling erosion of scales. They were used commercially in the first half of the 20th Century to
inhibit the formation of boiler scale, or to keep minerals in suspension within water,
whose solvent properties were changed by the influences of the scale-buoy. When water is activated by being exposed to the frequency emission discharges of the agitated scale-buoy, it becomes especially “reactive” to external factors as with sunspots and the like. Why this should be so is not yet understood, and certainly requires a concerted  experimental  effort  towards  clarification – but the “activation” principle does