Tonbo Imaging India Ltd. has filed its Draft Red Herring Prospectus (DRHP) with SEBI for an Initial Public Offering (IPO). The issue involves an Offer for Sale of up to 18,085,246 equity shares. Founded in 2003, the company is a leading exporter of thermal imaging systems with a global presence in 24 countries. Tonbo Imaging operates an asset-light model, focusing on design and IP ownership while outsourcing manufacturing.