
- CR1 series and CR3 hydrophones are individually spot calibrated at the factory; calibration guaranteed between -5°C and 30°C.
- CR2 hydrophones are not individually calibrated, but calibrated frequency response measurements can be performed for an additional fee.
- Cable terminated with male BNC connector (longer cable optional)
Cetacean Research Technology's C series hydrophones (listed below) have built-in preamplifier.

- Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
- 1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.
- Connectors are rated to a depth of 7,000 meters; see below (or to the side) for mating connector and cables.
Also see CRT-40P