The portable InfraCal biodiesel blend analyzer from Wilks Enterprise permits accurate blend ratio measurements in under a minute to help with biofuel percentages. The compact, rugged analyzer can be used by fleet managers, distributors, or regulators with or without knowledge of IR analytical techniques. It reads out directly in percent biodiesel and enables the user to measure the blend ratio on-site. Measurement range is 0 to 100% with an accuracy of ±0.20%. The InfraCal analyzer is a fixed filter IR instrument without moving parts and an insignificant optical air path, making it suitable for use in a field environment. Other features include a mass of less than 5 lb (2.3 kg), the ability to be operated from a battery pack or 12-V outlet, and an internal calibration table that provides a digital readout directly in percent biodiesel.