CT-497 Igniter Lead Connector Wear Gauge Igniter lead connector wear gauge for ARP670 type 3M fittings common to TPE331, TFE731 leads and others. Features a spring weighted pin for an accurate "pull test" of connectors. Size: 15/16 in./ 3.33cm Shipping weight: 1.6 oz./44.8g. Carton size: 31/2 in. X 11//4 in. X 11/4 in./8.89cm X 3.18cm X 3.18cm Note: Many leads incorporate type 2M and 3M connectors at opposite ends. Both the CT-496 and CT-497 gauges are recommended.