McMaster 5913T101 Belt Tension Gauge for V, Flat and Round Belts, for 7 8" Maximum Belt Width, 0–250 lbf G0529131 With a span of 2 4 With a span of 2 4 3 4 inches and a 1 4 inch pin diameter Range 32 Degrees to 140 Degrees F Accuracy (%) + 3 Power Requirement Two Alkaline AAA Batteries Accuracy + 3% Flow Material Water based non corrosive fluids Type Turbine Flowmeter Type Turbine Viscosity Maximum 20 cps Flow Rate Maximum 100 gpm Compatible Flow Material Water Shaft Material Tungsten Carbide Media Temperature Minimum 32 Degrees F Mounting Orientation Universal Rotor Material PVDF Media Temperature Maximum 140 Degrees F Frequency Minimum 1 4 kHz Output Type 4 20 mA Product Type Flow Meter Unit Of Measure Gallons Keep an eye on belt tension to minimize vibration Pick the gauge that matches your belt type