via Mooshimeter: The ‘Why Didn’t I Think Of That’ Multimeter

[...] It’s a multichannel multimeter that communicates with your cell phone over a Bluetooth connection. With two channels. the Mooshimeter makes it easy to graph voltage against current to plot a beautiful IV curve on your smart phone. [...]

600V and 10A with 24 bits of resolution [...] available for preorder for $100 USD.

This might be quite usefull