public abstract void set_accel(double accel);
public abstract void set_accel_g(double accel_plus_g, double accel_minus_g);
public abstract void set_pressure(double pa);
public abstract void set_accel(double accel);
public abstract void set_accel_g(double accel_plus_g, double accel_minus_g);
public abstract void set_pressure(double pa);