SET OF 4 CALIBRATED REFLECTIVE SINTERED PTFE POLYMER DISCS 8 MM THICK X 58 MM DIAMETER WITHIN SEALABLE CONTAINERS NOMINALLY 25, 50, 60, 80% REFLECTIVE SUITABLE FOR NIR PHARMACOPEIA SYSTEM VERIFICATION. STANDARDS SUITABLE FOR 60 MM NIRA II SPINNER. 1 * 1 items