De Proefzaak is a bar and restaurant in Amersfoort. It offers a wide range of affordable, local dishes and Kleiburg monastery beers.
The bar restaurant is located on the monumental Wagenwerkplaats railway complex, just behind Amersfoort Central station
| Day | Open | Close |
| Monday | closed | |
| Tuesday | closed | |
| Wednesday | closed | |
| Thursday | 3:00 pm | 11:00 pm |
| Friday | 3:00 pm | 11:00 pm |
| Saturday | 2:00 pm | 11:00 pm |
| Sunday | 2:00 pm | 9:00 pm |