This document is the instruction manual for NISSEI SOKKI CO., LTD.'s TX-27, TX-101A, TX-102, TX-402, TX-502 model SWR watt meter. The product features DC grounded antenna connector, true directional coupler, LED backlighting, three color scale, rugged metal cabinet, low bias Schottky diode detectors, precision large cross needle meter, individual meter scales for each power range.