The Headhunter SYM-Modules are tank fluid level sensors that measure the hydrostatic head pressure of a column of fluid in a tank vented to atmosphere and convert the pressure into an analog signal voltage output. The SYM-Modules are designed to be used with Headhunter Tank Sentry Panel models WTS-1500B, TS-1501B, TS-2500B, WTS-1100B, TS-2000B, and the TS-3000 Series (1-6) as well as PLC and computer monitoring systems.