The Hildebrand IRHD-MACRO-TB Test Block Set for Verification of IRHD-MACRO Measuring Device is a set of 7 test blocks for verification of IRHD-MACRO Measuring Device according to ISO 48. The Rubber Test Blocks are only for reference. Supplied test blocks are 30, 40, 50, 60, 70, 80, 90 IRHD Macro. The test blocks are supplied with a calibration certificate that includes mean value, range and standard deviation.