Specially designed for 253.7nm UV germicidal lamps (low-pressure mercury lamps). Self-equipped with , Mobile phone APP can get data from LS126C through Wireless Transmission Self-equipped with a real-time clock that can be used to trace the accurate time of the measurement result. Data storage automatically before timing shutdown, which makes unattended measurements possible. High-precision optical filters and professional UV sensor, which allow the instrument to almost give no response to other wavebands.