The Maretron Fuel Flow Sensor is for use with the FFM100 Fuel Flow Monitor. When fluid passes through the sensor, the rotors turn. Magnets which are located in the rotors will pass across sensors in the sensor circuit board. Pulses from these sensors are transmitted to the FFM100 which performs flow rate calculations based on the received pulses.• Flow Range: 25 to 500 LPH (6.6 to 132 GPH)• Nominal K Factor: 400 pulses/L (1514.2 pulses/Gal)• Operating Temperature: -40°C to 80°C (-40°F to 176°F)• Storage Temperature: -65°C to 170°C (-85°F to 338°F)• Port Size: 1/4 NPT Female• Strainer Size: 200 Mesh (If not already installed after fuel filter)• Cable Length: 1m (3.28 ft)• Weight: M1AR: 775g (1.71 lb), M2AR: 755g (1.66 lb).• Dimensions: 74 x 71 x 48.6 mm (2.91 x 2.80 x 1.91 in.) 1000 PSI Maximum Operating Pressure 1/4 Inch NPT Female Port Compatible With Fuel, Lubricating Oil, Hydraulic Fluid, Clean Petroleum Based Products