IGF::OT::IGF REQUIREMENT: PROVIDE A 1-100 GRAM MASS MEASUREMENT DEVICE FOR USE IN THE MICROGRAVITY ENVIRONMENT OF THE INTERNATIONAL SPACE STATION (ISS). DEVICE MUST FIT IN AND BE USED IN THE ISS GLOVEBOX. BACKGROUND: THIS DEVICE IS CRITICAL FOR LIFE SCIENCE RODENT RESEARCH AND ANY RESEARCH WHERE SMALL MASSES FORM 1 TO 100 GRAMS NEED TO BE MEASURED. PRESENTLY THERE IS NO CAPABILITY TO MEASURE SMALL MASSES IN THE ISS. THIS GREATLY REDUCES THE FIDELITY OF THE SCIENCE, ESPECIALLY WHERE COMPARISON WITH GROUND STUDIES IS REQUIRED. IN PHASE 2 THIS CONTRACTOR HAS COMPLETED AND TESTED A SUCCESSFUL " NEAR FLIGHT" MASS MEASUREMENT DEVICE THAT MET AND EXCEEDED PERFORMANCE REQUIREMENTS. THE PHASE III EFFORT WILL PROVIDE A FINAL INSTRUMENT READY FOR FLIGHT.