Riken Keiki Co., Ltd. manufactures and sells gas detection and monitoring equipment worldwide. It offers gas detection and indicator alarm systems for continuous monitoring; portable/personal gas monitors; portable gas leak checkers; entrusted experiment for measurement of leaked gas diffusion; toxic gas monitors/indicator alarm units; oxygen monitor alarm systems; portable combination gas monitors; optical gas indicator gas detection tubes; auto-emission and surface analyzers; gas indicators for medical use; and SALCON, a portable salinity analyzer. Riken Keiki Co., Ltd. was founded in 1939 and is headquartered in Tokyo, Japan.