BENDER A-ISOMETER FAULT LOCATION INDICATOR , IR475LY-421 OPERATING TEMP -10 deg C. TO + 55 deg C , SCREW TERMINAL CONNECTIONS MOUNTING DIN RAIL OR SCREW SUPPLY VOLTAGE DC 9.6 AND 84 VOLT POWER ON LED , ALARM LEDS , LED KOHM BAR GRAPH TWO ALARM RELAYS WITH SPDT CONTACTS , SELECTABLE FAULT MEMORY FOR MORE DETAILED INFORMATION , CLICK ON THE FOLLOWING LINK