When you shoot a monster fish, there is a potential that you may have landed a world-record fish, so make sure you have a certified scale to document your catch. The Neptonics Scale can weigh fish up to 660 lb or 300 kg, so we pretty much have you covered. This scale is the perfect size to keep in your dive bag or on the boat. Add a current certificate of calibration to claim your world spearfishing record. This product includes a heavy-duty stainless steel hook and D-shackle for hanging and securing fish. This fish-weighing scale has a measurement accuracy of better than 0.2% full scale and an easy to read LCD that displays in either pounds (lbs) or kilograms (kg). Calibrated to NIST (National Institute of Standards and Technology) Standards.