The minimum detectable depth of the DST-2 is typically 0.5 metres – which makes it one of the best in the world. The true minimum depth that is detectable depends far more on the depth transducer than the DST-2 because it is the transducer 'ringing' that determines the earliest opportunity that a returning echo signal can be detected. Please speak to your transducer manufacturer tech support team to understand the 'ring time' for your transducer.