MS48 Echo sounder by Kelvin Hughes. The top of the object has a sliding perspex screen which gives access to a paper printer. Inside is a plastic ruler covering the right of the paper, an onn/off switch. There are also loose nuts which are marked draught, density, volts; decay. The bottom of the front of the object has on/off, 0, paper, light, arrow symbol, dim/bright, TX and N/A switches, and a light button. The whole of the light blue coloured object front can be lifted up to access the printer and change the paper. Inside there are LCDs for sounds velocity and M/S and a red warning label. Underneath the object are socket entries covered with waterproof screw caps for PLA, SKJ, SKB, PLC, SKH, SKF, PLD, SKE.