Setra MRGSA Transducer W/Display Low Differential *** This Item replaces 2601MS1 for 0.5"wc and 1.0"wc applications only, for 0.1"wc AND 0.25"wc use item # MRCSC *** 0.5"W.C./100 Pa Unidirectional ±0.5"W.C/±100Pa Bidirectional, 1.0"W.C./250 Pa Unidirectio