Ultraosnic B transducer Ultraosnic B transducer Additional description: Model Length×width×thick HJ-B3.5M (80-130)×(13-16)×0.4 3.5MHz ≥0.37(K31) 2200-3000 (ETR3) HJ-B5.0M (60-110)×(12-15)×0.3 5.0MHz ≥0.36(K31) 2200-3000 (ETR3) HJ-B7.5M (50-100)×(10-14)×0.2 7.5MHz ≥0.35(K31) 2200-3000 (ETR3)