TEK Time Systems sells, services and warranties Wired and Wireless Master Clocks and Systems Manufactured by Lathem Time Inc. , Primex and Digital Display Systems. Our inventory includes Lathem LTR4-512 4-Circuit Master Clock & Signal Control, Lathem LTR8-512 8-Circuit Master Clock & Signal Control (Available with optional Internal Modem), Lathem ATX Mini Transceiver - AIR-TIME Mini Wireless Master Clock, Lathem ATX6 Transceiver - AIR-TIME Wireless Master clock, and Primex Wireless Systems. TEK Time Systems phone and on-line customer service staff members are available to answer all of your questions.