Under the Network Project a new one kg mass Comparator from M/s Sartorius AG Germany Model CC-1000S-L has been procured and installed during the year. The comparator has its maximum capacity 1 kg and repeatability of 2 μg. Using this new Mass Comparator, four 1 kg transfer standards have been calibrated against the national prototype kilogram with improved overall measurement uncertainty of 28 μg against existing CMC at 40 μg claimed in our CMCs of Appendix C of BIPM Database.