This BNC connector type probe is for the other models as well.
Milwaukee Instruments SE300 ORP Probe - Double Junction PLATINUM Electrode with 1 Meter Cable and KCL Gel Filled, Epoxy Shell, BNC Connector for General Use. For all "MW" & Old Style "SM" ORP Units - THIS Probe REPLACES THE OLD MA921B/1 ( SE 300 )
Note: We ship to the USA and Canada only.