TS42DLX test set with ABN. The TS40 Series come with all the features you need to be more productive, including a high-fidelity, two-way amplified speakerphone for true hands-free conversation. Advanced testing functions for low and high voltage and low current detection are displayed in easy-to-read LEDs. Always-on Monitor Mode simplifies operation and speeds testing. The TS44 PRO Test Set includes data lockout and lockout override.