The quality of interlaced yarns depends on node count, regularity, and tenacity of the nodes; crucial for downstream processes such as weaving and knitting. RAPID 600 V offers automated and servo-controlled pretensioning, string-up and sample removal for faster, more accurate testing of entangled filament yarns. Using a vertically moving pin, it detects entangled nodes, determining their count, distance, and tenacity per ASTM D4724. The mechanical pin system ensures only nodes meeting operator-defined tension are accepted. Designed robustly, it is not confined to laboratories, but can be used near production lines for early testing. This facilitates quicker evaluation of interlace quality and prompt reaction to irregularities. With total computer control and user-friendly handling, RAPID 600 V streamlines testing, leading to significant labor savings. An even higher automation degree can be achieved with RAPID 600 V in combination with SESS, Lenzing Instruments' Sequential End Sampling System for automatic and successive measurement of a customer-specified number of bobbins, directly off the transport buggy.