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 will be very helpful. It can convert current signals into voltage signals. Since every multimeter has a 100mV or mV range, we can 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 will not get too hot and for ensure long-term testing with little voltage loss.Part Name: 30A DIY Current Shunt.Maximum continuous working current: 15AMaximum continuous working time cannot exceed 15 minutes when the working current is 30ASafe working voltage: 30V AC or 60V DCAccuracy: 0-1KHz 0.3%, 1-5KHz 10A 5%Current-to-voltage ratio: 1mV/1APower input port: 4mm safety banana .Voltage output interface: 4mm flashlight interfaceColour:PurpleMaterial:ABSPackage Contents:1 x DIY multimeter 30A current shuntOnly 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.