SOLSTAT EPM-900 Bench/Portable Digital pH/mV Meter

EPM-900 ... Bench/Portable Digital pH/mV Meter
SOLSTAT's bench/portable pH/mV Meter solution
Packaged in an attractive instrumentation case, this unit was designed as a dual-purpose (pH/mV) meter.  It was portable, battery operated
(alternatively powered by a wall-wart DC supply), and offered switchable mV and pH functionality (with Automatic Temperature Compensation).