Lab Plus Ultrasonic Pulse Velocity Tester comes with an extended feature set Consisting of: Display unit; 2 transducers (54 kHz); 2 BNC cables 1.5 m (5 ft); Couplant; Calibration rod; USB charger with USB-cable; 4x AA(LR6) batteries; Data carrier with software; Documentation and carrying case In addition to having all the features of the Pundit Lab, the Plus includes an integrated gain stage making an external amplifier unnecessary when using long cables or exponential transducers...