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 0.5percent accuracy 1mR four-wire sense resistors with an input of 1mV or 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. Part Name: 30A DIY Current Shunt. Maximum continuous working current: 15A Maximum continuous working time cannot exceed 15 minutes when the working current is 30A Safe working voltage: 30V AC or 60V DC Accuracy: 0-1KHz 0.3percent , 1-5KHz 10A 5percent Current-to-voltage ratio: 1mV or 1A Power input port: 4mm safety banana . Voltage output interface: 4mm flashlight interface Colour: Material:ABS Package Contents: 1 x DIY multimeter 30A current shunt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.