Chison L7M-A Convex array transducer has frequency range of 5.3 -10.0 MHz. Chison L7M-A Convex array probe is designed for Musculoskeletal (MSK), Superficial, Vascular and Venous applications. It is compatible with the Chison Eco 2, Chison Eco 3 Expert, Chison Eco 5 ultrasound machines.