Free cash flow is calculated as GAAP net cash provided by operating activities less purchases of property and equipment and intangible assets.

ENGADGET: NVIDIA posts Q4 2013 earnings: $1.1 billion in revenue, $174 million in profit

But unlike that, the watt-balance experiment can be performed by anyone at any time provided they possess the right equipment and expertise.

ECONOMIST: Weighing a kilogram

The primary services provided by the company include: hydraulic fracturing, coiled tubing, wireline, and equipment manufacturing.

FORBES: Miami University Students and This Quant Pitch C&J Energy Services