Berg offers a wide range of eddy current calibration blocks in different shapes and sizes. These include 3-notch standards, DAC GSET reference standards, MIL-STD 271F reference blocks, Navy standards and USAF standards. These standards also come in many different materials. If you have any questions about our eddy current calibration blocks, please give us a call at 1-847-577-3980 or email us at email@example.com. Our experienced staff is more than happy to help.