Model 300 External Calibrator
The Neptune External Calibrator is a variable ratio-changing device, which eliminates the need for change gears. It is located between the flowmeter and Model 800 Series Register. The calibrator mechanism is enclosed in a sturdy aluminum housing and can be installed on any 2" or larger Neptune flowmeter that uses an 800 Series Register.
Model 300 External Calibrator Features

  • One adjustment dial
  • Adjustment range ± 7%
  • Eliminates Changing Gears
  • Easy Installation
  • Sealable by Weights and Measures