Hall sensor with a digital display module (speed / counter / timer)

GY-45 MMA8452 Three Axis Accelerator Shield Module for Arduino

This is a breakout board that contains MMA8452 IC, which is a 12-bit resolution 3-axis accelerometer. It can detect ±2g/±4g/±8g accelerations. It has I2C communication interface.   
 

GY-87 10DOF MPU6050 HMC5883L BMP180 Pressure sensor module

GY-86 10DOF MS5611 HMC5883L MPU6050 module MWC flight control sensor module

GY-50 L3GD20 3 Axis digital gyroscope sensor module angular velocity module for Arduino