In February 2018, the product HH1F "Point-type combustible gas detector with a measuring range of 0-100% LEL" independently developed and produced by Hanhai Opto-electronic passed the inspection of the National Fire Electronic Product Quality Supervision and Inspection Center and the site of the Fire Product Conformity Assessment Center of the Ministry of Public Security. After inspection, it obtained the compulsory certification of fire products from the Fire Products Conformity Assessment Center of the Ministry of Public Security.