The AVK-1000 vacuum mass comparator can be equipped with the LOAD LOCK system for carrying mass standards. The system enables switching or adding artefacts without changing the atmosphere inside the main chamber. The LOAD LOCK significantly shortens the process of providing the right vacuum value to up to 5 hours counting from the moment of device start-up. It is equipped with a separate pump system and a very precise vacuum gauge. A specially designed viewfinder enables monitoring of both comparison and transport process. Supplementing the AVK-1000 vacuum mass comparator with LOAD LOCK system significantly improves the efficiency of comparison.