Groz FM-100 Mechanical Fuel Meter, 3/4" NPT (F), Gallons, 4-20 GPM, 50 PSI, +/-2% Accuracy, Nutating Disc, 3-Port in-Line or 90-Degree, for Diesel Gasoline Biodiesel and Oil (45682)

Stop logging fuel transfers by guesswork. The Groz FM-100 Mechanical Fuel Meter delivers +/-2% accuracy, +/-1% repeatability, and 0.10-gallon resolution on every diesel, gasoline, biodiesel, or light-oil transfer, with both a resettable batch totalizer and a non-resettable lifetime totalizer so you always know what went out today and what's gone out total.Built around a proven nutating disc mechanism in a robust aluminum die-cast housing with PBT, Viton, and stainless steel wetted components, the FM-100 handles 4-20 GPM (15-75 LPM) at up to 50 PSI from 14F to 150F. The 3-port design lets you mount it in-line or at a 90-degree angle on 3/4" NPT (F) threads, and the register cap is removable and rotatable in 90-degree increments for clear readout from any orientation.Use it with electric transfer pumps or run it on gravity flow with a minimum 4-foot head — no power needed. Easy user re-calibration keeps it accurate over years of fleet fueling, farm and ranch tanks, generator top-offs, marine fuel handling, and shop oil dispensing. Do not use with water-based media. Not to be used to measure media for resale.

• STOP GUESSING ON FUEL TRANSFERS - Track every gallon dispensed with +/-2% accuracy and 0.10-gallon resolution; resettable batch totalizer (up to 999.9 gal) plus non-resettable lifetime totalizer (up to 99,999.9 gal) keep job and tank records honest.
• BUILT FOR THE FIELD - Robust aluminum die-cast body with PBT, Viton, and stainless steel wetted components stands up to diesel, gasoline, biodiesel, and low-to-medium viscosity oils across a 14F to 150F working range.
• FAST, FLEXIBLE INSTALLATION - 3-port design lets you plumb the meter in-line or at 90 degrees with 3/4" NPT (F) inlet and outlet, and the register cap pops off and rotates in 90-degree increments so the readout always faces you.
• PROFESSIONAL-GRADE FLOW - Rated 4-20 GPM (15-75 LPM) at up to 50 PSI working pressure with +/-1% repeatability; pairs with electric transfer pumps or runs on gravity feed with a minimum 4-foot head — no power required.
• PROVEN NUTATING DISC MECHANISM - Mechanical nutating disc tolerates real-world fuel contamination, supports easy user re-calibration, and fits fleet fueling, farm tanks, generator top-offs, marine fuel transfer, and shop oil dispensing. Do not use with water-based media.