How to get weight scale indicator in C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace Test2
{
    public partial class Form1 : Form
    {
        int sec;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            serialPort1.Close();
            serialPort1.PortName = "COM1";
            serialPort1.BaudRate = 9600;
            serialPort1.Parity = Parity.None;
            serialPort1.DataBits = 8;
                serialPort1.StopBits=StopBits.One;
                serialPort1.ReceivedBytesThreshold = 1;
                serialPort1.DtrEnable = true;
                serialPort1.RtsEnable = true;
                serialPort1.Open();
                int reading = serialPort1.ReadByte();
                label1.Text = reading.ToString();
                
            timer1.Interval=1000;
            timer1.Enabled=true;



            sec = 0;

        }
        private void readData()
        {
            label1.Text = serialPort1.ReadExisting();
        
        
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            readData();
        }
    }
}