The SMART one & SMART probe is a revolutionary network installation and troubleshooting tool, it goes entirely above and beyond the traditional methods to trace and identify cables. In the past, when using tone and probe tool, you had to listen quite closely to identify the tone signals; it was easy to confuse the signal with surrounding noise making it difficult to be certain of the results.The SMART one & SMART probe uses advanced digital signal technology to trace and identify cables in high speed and high precision; avoiding noise and false signals. It is a true breakthrough beyond traditional testing methods.The SMART one and SMART probe is also compatible with traditional analog tone generators.Finally, it is not only a digital Tone and Probe but also a cable tester; it can test cable continuity, telephone service/polarity, and even wire mapping.