As pointed out in other answers, wear and tear of work equipment is generally the employer's problem. In [tag:germany] specifically, the law is even more in the employee's favor: In general, **employees are only (fully) liable for gross negligence**.

It is well-established by court precedent that for all activities that are part of an employee's duty, the employee is _not_ liable for damages, even if the employee was negligent - unless the employee was significantly negligent (or acted with malice). The German [Wikipedia article on Arbeitnehmerhaftung][1] explains this in more detail.
Even in case of significant negligence, liability is often limited.

Additionally, in your case it is not even clear you caused the damage (as the laptop is used, and may have been damaged by the previous user). So to make you liable, your employer would need to establish that

* you actually damaged the laptop, _and_
* you did so out of negligence (i.e. it was not just regular wear)

No employer is going to bother with that, they will just eat the cost.


  [1]: https://de.wikipedia.org/wiki/Arbeitnehmerhaftung