A scale adaptor (optional) allows weighing of the fermentor. It is simply placed under the front part of the fermentor body and connected to the X-channel input of the fermentor. By means of a pump connected to the ”Pump X”-socket of the fermentor, the weight (volume) of the culture can be kept constant. This function is included in the start-up kit already. This allows the running of continuous cultures at low cost.