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Check the listing for details. communication RS232 FA8E-6NN2B 6 digits Digital Tacho/RPM/Frequency/HZ Meter. Condition: New. Listed at 176.27 USD. 600V), range: 0.01Hz--100KHz (max 100KHz), accuracy: 0.01Hz. 1, Input: various wave form pulse signal (proximity switch,photoelectrical switch or AC. 3, 6 digit display, with demical point switched automatically; Opical isolation for input and.