Hanna Instruments BL 932700-0 Mini ORP Controller with 4-20 mA Recorder Output and 12 VDC Power Adapter
The Hanna Instruments, BL982411-0 MINI ORP controller is one of the most cost effective approaches for reliable and continuous ORP monitoring. The controller has a pH range of 0.00 - 1,000 mV and comes with a 12 Vdc adapter and 4-20 mA analog output to allow it to hook up with recorder devices or pumps . The ORP electrode, HI2001, is sold seperately.