| ITC Model Number | Model number assigned by ITC |
| Type | Indicates whether a unit is principally a hydrophone, or can be used as either a projector or a hydrophone. If unit is a hydrophone, it may have an integrated preamplifier. |
| Resonance Frequency (fr) | The frequency of the peak conductance value of the final (tuned or untuned) transducer. |
| Depth | Suggested,safe maximum depth of use: the survival depth is greater. |
| Envelope Dimensions | Maximum envelope dimensions of the unit in generic shapes. Might be slightly rounded:Spherical ... Diameter (D)
Cylindrical ... Diameter(D), Height(H)Parallelepiped ... Length(L), Width(W), Height(H) |
| TVR at fr | Nominal TVR (Transmit Voltage Response) at fr. |
| Midband OCV | Nominal OCV (Open Circuit Voltage) value, well below fr. |
| Suggested Band | For a projector, the band is generally around its resonance (fr); for a hydrophone it is wider, covering LF's. |
| Beam Width at fr | Nominal half-power (-3dB) beamwidth at fr. |
| Beam Pattern Type | Nominal shape of the beam pattern: Spherical, Toroidal, Fan, etc. |
| Input Power | Estimated safe maximum input power with <10% Duty Cycle and short pulses (<100 ms), excluding the limitations due to cavitation. |
| Preamplifier Type | Input, Output and Functional Features of a preamplifier: Single or Differential and Voltage or Current. |
| Toroidal Beam | Two resonances are utilized in free-flooded, toroidal beam transducers: cavity (LF) and Radial (HF). The table lists both of these resonance values. |
