YSI ProOBOD [626400] Optical BOD Probe. The YSI ProOBOD probe is designed for use in the lab with the YSI ProODO dissolved oxygen meter. The ProOBOD easily connects to the ProODO handheld dissolved oxygen meter and makes it convenient to conduct lab BOD's with a very compact footprint. No warm-up time is required and this YSI probe offers extremely quiet operation. The smart sensor of the YSI ProOBOD probe retains calibration in the probe and its body is tapered to fit into a standard 300 mL BOD bottle and international versions. The ProOBOD's self-stirring feature provides a representative sample and increased response times.