Features * Various input/output options (by model) - Input options: DC voltage, DC current, AC voltage, AC current - Output options: RS485 communication output, PV transmission output (DC 4-20 mA), NPN/PNP open collector output, relay contact output *default option: indicator/no output * Maximum allowed input: 50 VDC, DC 500 mA, 250 VAC, AC 5 A * Display range: -1999 to 9999 * High/low-limit display scale function * AC frequency measurement (range: 0.1 to 9999 Hz) * Various functions: peak display value monitoring, display cycle delay, zero-point adjustment, peak display value correction, PV transmission output (DC 4-20 mA) scale * Power supply: 12-24 VDC/VAC, 100-240 VAC