525TID-TMD 1kW Depth/Temp TM-258 Furuno 10 pin plug, c/w bracketTM 258 operating at 50 and 200 kHz, the TM258 features an elliptical beam from four ceramic elements. The beamwidth is narrow on both frequencies for excellent resolution in both shallow and deep water. The TM258 comes with a rugged stainless steel mounting bracket that is easy to install and has a streamlined shape. The combination of power and sensitivity has made this the high performing transducer of choice for use with conventional fish finders.