What I have noticed is that the pitch in a crow call can be the difference in night or day for a gobble. I have had one not work and to turn around and use another with a different pitch and it works fine. I carry 3 different ones with me 2 from name brand companies and 1 in my voice box

Locators are the same as turkey calls themselves. The air presure can change the pitch of calls on anyone day and what worked yesterday may not work today. Having a free range of calls can and will make the difference between roosting and roasting...BT