EPM-1000 ... Laboratory Bench Mains Digital pH/mV Meter SOLSTAT's original Laboratory Bench Mains Digital pH/mV Meter Constructed in an attractive and innovative 3-piece case which allowed easy disassembly, this unit was designed as a dual-purpose (pH/mV) 3½ digit laboratory meter.  It was mains operated and offered full pH and mV measuring functionality (with Automatic Temperature Compensation).  As with all SOLSTAT bench/digital instruments the EPM-1000 had a 10-turn asymmetry control