Spot Testers PD74iHandheld wireless PD detector.Supports UHF, HF, TEV and Acoustic methods. PD61Portable PD detection and location instrument fro cables, transformers and more. PD71Portable UHF PD analyser for Gas Insulated Switchgears (GIS). Permanent Monitors PD404Partial Discharge monitoring for HF PD particularly HV cables PD700Complete UHF PD monitoring system for Gas Insulated Switchgears (GIS).