I picked this up so I could use my clamp meter to test items plugged into the wall safely without having to create my own "breakout" wires. Works great with Fluke A/C clamp meter attachment on my Flike 87V. Kinda big in size in the tool bag, but I don't know how it could be much smaller and still have the regular and 10x test areas along with the probe insert holes. Good product and a must have for a clamp A/C meter.