Cal. Corp. Code § 1602

Every director shall have the absolute right at any reasonable time to inspect and copy all books, records and documents of every kind and to inspect the physical properties of the corporation of which such person is a director and also of its subsidiary corporations, domestic or foreign. Such inspection by a director may be made in person or by agent or attorney and the right of inspection includes the right to copy and make extracts. This section applies to a director of any foreign corporation having its principal office in California or customarily holding meetings of its board in California.