An acoustic caliper and a calipering method having reduced or eliminated blind spots. In one embodiment, the acoustic caliper comprises an array of two or more transducers that can detect acoustic pulses transmitted by other transducers in the array. One method embodiment comprises: transmitting an acoustic pulse from a selected transducer in a transducer array; configuring the array to listen for a reflection of the acoustic pulse; and determining a travel time for the acoustic pulse if a reflection is detected by at least one transducer in the array.