TensionRite Belt Frequency Meter, Includes (4) AA Batteries, Calibration Tuning Fork, Protective Case, Features Direct Rather Than Indirect Measurement of Vibration Frequency, Meter Range Matches In. Real Life In. Belt Installation Parameters, Quartz Crystal Based Solid-State Circuitry, For Belt Series TensionRite (R), For Belt Trade Size Universal, Includes Batteries Yes, Power Source Battery, Product Type Belt Frequency Meter, Testing Tool Material Aluminum, Units of Measurement Hz. This item has been restricted from sale in the following state (s): []