HC-020K Double Speed Measuring Module With Speed Encoder KitFeature:HC-020K is a high resolution, short response speed, wide voltage switch output speed measuring module, with black encoder can measure motor speed (Now provide the encoder type D, hole diameter is 4 mm. Can be used to output shaft is 4 mm motor).Description:Working voltage: 4.5V to 5.5 V.Transmit tube pressure drop: Vf = 1.6 VTransmit tube current: 20 mASignal output: A, B two way; The TTL levelDistinguish precision: 0.01 mmMeasurement frequency, 100 KHZEncoder diameter: 24 mmEncoder type D hole diameter: 4 mmThe encoder resolution: 20 lineSpeed measuring sensor configuration: The configuration can measures 1 road motor speed