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MEGGER SST-9203 Solid-State Digital TimerVersatile timing instrument for many utility applications. Rugged design for years of daily field use. ±0.0001-second accuracy. Battery or line operated.The SST-9203 Solid-State Digital Timer combines ruggedness and reliability with state-of-the-art technology to make it an accurate and versatile timing instrument available for utility applications.Designed specifically to measure the operating time of solid-state and electromechanical relays, circuit breakers, contactors or similar switching devices, Model SST-9203 can be easily used in the field, shop or laboratory.