Code setting 0 as the highscore [Read description]

The point of my game is that the timer ticks from 10 seconds, and you should tap the screen or space as close to 0 as possible. My code is checking if my current score is closer to cero than the highscore. This works perfectly exept the fact that the highscore is always 0. I can manually se the score to be 10, and it works. How can i not make this code set my highscore to be 0, but let the highscore start at 10?

     public float counter = 10;
     public float HighScore = 10;
     public TextMesh text;
     public TextMesh text3;
 
     // Use this for initialization
     void Start () {
 
         HighScore = PlayerPrefs.GetFloat ("High", 0);
         Time.timeScale = 1f;
     }
     
     // Update is called once per frame
     void Update () {
 
         counter -= Time.deltaTime;
         text.text = "" + counter;
         text3.text = "" + HighScore;
 
         if (Input.touchCount > 0 || Input.GetKey (KeyCode.Space)) {
         
             CheckHighScore ();
             Time.timeScale = 0f;
         }
 
         if (Input.GetKey (KeyCode.A)) {
             Application.LoadLevel ("level");
         }
 
     }
 
     public void CheckHighScore(){
         if(Mathf.Abs(counter) < Mathf.Abs(HighScore)) {
             HighScore = counter;
             PlayerPrefs.SetFloat ("High", counter);
         }
     }                   
 }