The Programmable Switch Probe is a item part of the 1.12.2 remake of the Secret Rooms mod. It is used to change the appearence of the SecretRoomsMod blocks. Right click while holding this item to open a gui. Type the OreDict or registry name of the block into the gui. If the block exists, the Gui will display the outputs. If there is more than one block with the OreDict/registry name, simply select the block you want.
The selected block will appear below the text box.