The National Data Buoy Center intends to negotiate only with Setra Systems, Inc. of Boxborough, MA for 25 Each, Model 270 NDBC-5 Special Barometers; 800 to 1100 mbar range, 0-5 VDC output barometers.  The NDBC uses the analog output 0 to 5 VDC, 800 to 1100 mbar range barometers on all automated weather buoys and coastal weather stations that have VEEP, MARS or ARES electronic data acquisition systems installed on them.  NDBC analog 800 to 1100 mbar barometer specification:  Full range 800-1100 mbar; accuracy +- 0.05% FS; repeatability 0.01% FS; non-linearity best fit straight line +- 0.03% FS: male 1/8 DQut X 0.125DQut with #6-32 Unc 2b thru 4 holes and 0.187DQut thru four holes; Mil Spec Electrical Connector P/N: MS3112E12-10P or equivalent 9.22 Turn Potentiometers (zero & span); Compensated temperature range (-20 to 50 degrees C) with a DZ/DT Specification of 0.2% of FS/100f; Calibration & temperature compensation data to be shipped with unit.