Many benchtop and handheld multimeters cannot test currents above 10A. Even if they can measure 10A, they cannot be used for a long time because the internal sensing resistors overheat, which can easily damage the multimeter. On the other hand, many multimeters do not have current levels, or the current levels are too small, such as 1A or 3A, then these 30A current shunts be very helpful. It can convert current signals into voltage signals. Since every multimeter has a 100mV or mV range, now use the 100mV or mV range to measure larger currents, and there is no problem measuring currents up to 15A for a long time. These DIY 30A current shunts use 0.5% accuracy 1mR four-wire sense resistors with an input of 1mV/1A. When testing 15A current, the four-wire sense resistors only consume 0.225W, so they not get too hot and for long-term testing with little voltage loss., Weight: 0.14550509292 Pounds, Manufacturer: Ehwisbe