TAG5000S 4 to 500kV - Wireless Phase Comparator 

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Wireless phase comparator for three phase network with nominal voltages from 4 kV up to 500kV - 50 Hz or 60 Hz (to be specified). Shall be used with two insulating sticks (not included) complying with the nominal voltage and having universal adaptors. 
Advantages:
Light and compact units for overhead lines 4-230 kV
Specific High-Voltage probe extensions for use on 110-500 kV over-head lines
Safety Medium-Voltage electrode extensions (grey) for use on 4-36 kV indoor use
Positive indication for ‘’in phase’’ conditions
No hazard due to a cable link
Increase distance of operation (more than 25m)
Possibility of phasing through walls (inside outside)