Although tiny and limited to 10 amps, they do give you continuous current draw as you add more loads. Works well to monitor LED lights and small drawing DC motors.
Seems to work OK, but the product is not quite as pictured. The current sense element is a surface mount resistor, not a loop of nichrome wire as is shown in the picture. After seeing a poor review and picture of a failed surface mount resistor on another listing (possibly on Amazon), I purposely chose this item for the wire loop sensing element and was disappointed to see the resistor. Oh well, the price was low.