Strela - fuel volume (level) sensors, 500-1500 Hz frequency output, interface RS232 or RS485 with data communication protocol "omnikomm" and MODBUS, 0-5 V, 0-7 V or 0-10 V voltage output. Can be used with GPS-monitoring devices. Precision of level measurements, ±0.1% from length Limits of additional conventional error < ±1.0 %