The abacus collected by He Zelin (Haikou, China) is crafted from Hainan huanghuali (Dalbergia odorifera T. C. Chen) using a full mortise-and-tenon structure. It measures 254 cm in length, 4 cm in width, 21 cm in height, and weighs 9.3 kg. Verified by the WRCA, it has been confirmed as the “Largest Hainan Huanghuali Abacus”.