1. Cavity probe's signal resistance is smaller which can improve the accuracy of orientation.

2. Larger mud flow area makes the displacement, cycle pressure and sand returning ability improved.

3. Special shock absorption device is installed into the cavity which improves the shorck absorption effect greatly and protects the

cavity probe effectively extending the work life of probe.

4. Easy installation and uninstallation save time greately.

5. Reasonable designing improves the probe work life enormously.

6. Normal and non-magnatic cavity probes are available.