EPM-1500 ... Research Bench Mains Digital pH/mV Meter Circuit Board Set
These were the two circuit boards which comprised the electronics of the EPM-1500 research meter. The instrument was mains operated via the on-
board transformer and highly regulated power supply. The boards were interconnected by removeable pin leads. The very stable high-impedance
front end was designed around a monolithic dual FET in a log-tailed pair configuration. Only the best quality op-amps were utilised throughout.
The instrument enjoyed great support from the New Zealand scientific community, having regard for the quality of the multi-national opposition.