Methods : ASTM D8274, IP 639 SetaCheck Biodiesel Plus is a handheld instrument designed for fast, accurate, and repeatable on-site measurement of biodiesel content in diesel fuel blends. Using advanced Mid-IR technology with a measurement range of 0.1% to 80%, it requires only 2 ml of sample and delivers results in under 1 minute. With a simple test procedure that requires no special skills or laboratory conditions, SetaCheck Biodiesel Plus is ideal for batch fuel checks at terminals or monitoring standby fuel supplies with ease and efficiency.