TriggerTester.cs

using UnityEngine;

public class TriggerTester : MonoBehaviour
{
    private SteamVR_TrackedObject trackedObject;

    [SerializeField]
    private bool trigger;
    [SerializeField]
    private bool trackpad;
    [SerializeField]
    private bool grip;
    [SerializeField]
    public bool menu;

    private void Start()
    {
        trackedObject = GetComponent<SteamVR_TrackedObject>();
    }

    private void Update()
    {
        var device = SteamVR_Controller.Input((int)trackedObject.index);

        trigger = device.GetPress(Valve.VR.EVRButtonId.k_EButton_SteamVR_Trigger);
        grip = device.GetPress(Valve.VR.EVRButtonId.k_EButton_Grip);
        trackpad = device.GetPress(Valve.VR.EVRButtonId.k_EButton_SteamVR_Touchpad);
        menu = device.GetPress(Valve.VR.EVRButtonId.k_EButton_ApplicationMenu);
    }
}