Some older designs use a wire between phasing sticks in order to make their measurements. The Amblyonix Industrial Instruments Company’s model 800 Wireless Phasing sticks communicate via Bluetooth, which eliminates a possible hazard…and allows for quick and safe safe testing of phase relationships.
The model 800 employs a unique, interactive, hand-held interface that displays phasing, phase angle, frequency, and vector diagrams instantaneously and accurately.
Click this link to see a demo of the Model 800 on YouTube.