When the racks are set in the InStocker and STAT rack set position, the pickup arm unit transfers each of them to the sampler barcode reading position and to the dispensing lane. This button is used for general operational checking of the sampler. The racks are transferred to the rack collection stocker at the end. The number of racks to be set in the InStocker and STAT rack set position should be at least [number of dispensing lanes + 1]. If the I/O check is completed without an error, "OK" is displayed in the text field on the right.