sensor compatibility All sensorheads are compatible and can be mounted on the following Sonic Tension meter models: Sonic 505C Sonic 507C Sonic 508C Sonic 550C Sonic 608 Sonic BDTM201 SANKER GATES UNITTA Tsubakimoto Replacement cord sensor for use with model U507C U508 U550 SK608 BDTM201 (SKM-MM) sonic tension meter (not included) Microphone reads belt vibrations from 10 to 5,000 Hz for conversion to tension value Notched connector for reliable attachment to meter In each standard package, a flexible acoustic arm sensor is included. Easily connect the sensor to your SANKER U-508 Tension Meter thanks to male – female connectors on both devices. Simple and practical! . 170 mm. arm length . Range: 10 – 5.000 Hz