Master Angler's Rod (a.k.a Caster of the Master) is a fishing pole that can be obtained when reaching Mastery Rank 120. It can fish anywhere that any other fishing pole can.
Despite the fact it can fish anywhere, it's important to notice that this rod will not fish on lava or chocolate if the player has not yet unlocked the Molten Magma Sifter and Candied Fishing Cane rods, respectively.