RangerBio Technologies Co., Ltd. situated in the scenic Songshan Lake National High-tech Zone, Dongguan City, Guangdong Province, is an analytical service and development organization established in 2014 by Dr. Janshon Zhu, a renowned analytical chemist. Under RangerBio, there are two holding companies, Rangerta Biological Equipment Co., Ltd. and Ranger Analytical Testing Co., Ltd. RangerBio research and development concentrated on mass spec analysis ranging from sample processing, olfactory ion-source, pseudo internal standard (PIS), continuous flow injection analysis (cFIA)，palm mass spectrometer, and so on. Our long-range goal is to promote treatment drug monitory (TDM) for precise medicine and mass spec application in disease diagnosis. Patent filings and issuances are occurring in rapid succession. New products are continuously emerging from our R&D pipeline. Currently, we have a sample extraction product line, the eETray (express Extraction Tray) is on the market, a smell ion source and a PIS autosampler, and an evaporative light scattering LC/MS appending detector are in production. RangerBio is providing more and more innovative products for chemical analysis with mass spectrometry. Our analytical services are provided through RangerBio’s subsidiary, Ranger Testing Co. Ltd., including method development and validation, structure elucidation, metabolite dentification, impurity profiling, compound purification, DMPK and so on. In order to better serving the drug and biotech industries, Ranger Testing also provide instrument refurbishment, sales, and repairs. Ranger Testing is equipment with all types of hyphened mass spectrometric instruments, including LC/MS, LC/MS/MS, GC/MS, ICP-MS, CE-MS, high accurate mass, and so on.