I recently obtained this Mettler K7T laboratory scale from the late 1950s to early 1960s. It has a resolution of 100mg with a capacity of 800g.
The internal mirror was fairly dirty, so I gave it a clean with isopropanol.
The case didn’t actually have any normal rust spots, this looks more like some corrosive chemical spilled onto there at some point. I cleaned the surface rust off and applied a layer of Ballistol, to prevent new rust. I also removed the cellular tape remains with brake cleaner.
As with all my mechanical Mettler balances so far, this one uses a B15S 6V lamp as well and mine also had a replacement bulb in the case.
Using my cheap OIML M2 weight set. I did not calibrate the balance, just tared it to zero.
|Read||Nominal Weight||Displayed Weight||Deviation abs(Δ)1)|
1) Deviation is the deviation between the nominal weight and the actually displayed weight