Numerous sample racks are available; these can accommodate between 12 and 148 sample vessels. The 858 Professional Sample Processor can select up to 999 sample positions. It is also possible to access an external position, e.g. for dilutions. The Professional Sample Processor provides connections for two diaphragm pumps and three MSB devices, such as the 800 Dosino or 801 Magnetic Stirrer. The sample rack and the sample vessels with stoppers belong to the optional accessories of the 858 Professional Sample Processor. This ensures maximum flexibility in selecting the optimal combination. Operation of the 858 Professional Sample Processor requires the MagIC Net™ software.