My other laboratory scales and balances: Mettler B5, Mettler P1210, Sauter L10
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.
Cleaning
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.
Test
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) |
|---|---|---|---|
 |
10g | 10g | - |
 |
20g | 19,8g | 0,2g |
 |
50g | 49,2g | 0,8g |
 |
100g | 100g | - |
 |
200g | 198,6 | 1,4g |
 |
500g | 500g | - |
1) Deviation is the deviation between the nominal weight and the actually displayed weight
Links
- Mettler K4T Balance (Manual for the K4T, K5T and K7T linked at the bottom!)
- Mettler History