# Securing scientific instruments: scale, lens, and the brass you do not polish

> Securing instruments: leave the brass patina, keep lenses dry, small devices off the windowsill.
> Quelle: https://tresorrari.de/artikel/wissenschaftliche-instrumente-sichern · Stand: 2026-10-01 · Tresorrari Redaktion

A microscope, a sextant, a balance: brass, glass, a scale. If you polish the brass to a high shine, you often erase the patina that proves the age. In the overview [Security for collectors](/artikel/sicherheit-fuer-sammler), this is a technical piece between the certified safe and the shelf.

## What breaks without a thief

Moisture on the optics, a windowsill in the sun, a scale that you rub with the wrong agent, a case whose hinge breaks. You store dry, lenses with a cap or in the case, brass unpolished, as long as the patina belongs to the piece.

## When someone comes

Small devices go along in the drawer. They do not lie among the tools, where they look like junk and still get taken or thrown away. Documented pieces in the cabinet or in their own case, locked. The invoice in the document cabinet.

## The folder

Device, maker, number, accessories as their own lines, proof, photo of the scale. Missing accessories are listed as missing.


## Häufige Fragen

### Polish the brass?

No, if the patina belongs to the condition. Dust yes, high shine no.

### Take a lens apart yourself?

No. Fungus and adjustment belong in specialist hands.

### List accessories separately?

Yes. One eyepiece less is a different price.