Surge counter by PARALEC Line Lightning Surge Counter, 3 cores 16 mm split core diameter, 3m connection cable
• High sensitivity universal counter
• Monitoring of lightning protection equipment: lightning rod, surge arrester, EGLA, MOA, MOR, SPD, TLA, ground lead, ground rod...
Two versions of the split core exist, up to 16mm (standard) and up to 20 (on request). The 16mm split core is suitable for ground lead with diameters from 5 to 26 mm.
https://surge-lightning-arrester-monitoring.com/product/sc250-analogic-surge-counter/