"SOLD STATE MODULE PROVIDES EXCEPTIONAL OPERATIONAL AND TEMPERATURE STABILITY; DESIGNED TO PLUG INTO THE CHASSIS OF MCNAB'S MODEL 1C/SB7 SALINITY INDICATING SYSTEM; THIS UNIT PROCESSES DATA FROM MULTIPLE SALINITY MODULES AND DISPLAYS THE MEASURED VALUE IN APPROPRIATE ENGINEERING UNITS AND RANGE FOR ANY ACTIVE SALINITY CHANNEL, UP TO 7; BUILT IN METER CHECK FUNCTION PERMITS THE USER TO ROUTINELY CHECK THE OEPRATION OF THE MODULE; ZINC CHROMATE PRIMER, ENAMEL PAINT; PLUG IN MOUNTING; SIMULATE: ON BOARD TO PERFORM METER CHECK AND TO FACILITATE IN SETTING ALARM LEVELS; PPM CHLORIDES AND MICROMHOS, SEMI LOG, VARIOUS COMMON SCALES AVAILABLE; SCALE RANGE 0 TO 5 PPM"