Impact-resistant and airtight housing with IP67 water and dust protection. New composite, frost-resistant sensor (significantly increased service life) The cable is frost resistant and reinforced with @Kevlar thread for maximum strength. The battery compartment with sensor can be removed from the echo sounder Advanced echo sounder control (4 buttons) Sonar Praktik 6M works up to a depth of 25m, is able to detect and sort fish according to a defined algorithm and digitally reflect the density of the soil. Innovation - inform about the diameter of the echo sounder beam coating. The soil density index is from 0 to 40 and will easily help to understand whether sand, stones or sludge are hidden underwater.