Classic Water-proof mono contact Hydrophone is a classic black hydrophone handcrafted with high quality parts. The hydrophone cable is made of oxygen free OFC copper. Cable length 5 meters (196 INCH) !

Finally you can throw the hydrophone in the unreachable places! Jack cable is High quality 6.3mm jack plug. Hydrophone size - 5.5 cm.
 
Working range -5°C - 40 °C