The Master's TARDIS

The Master appears to have had several TARDIS's throughout his engagements with the Doctor.

Model and Type
In his first encounters with the Doctor, the Master used a Type 40 Mark II.

Unlike the Doctor's TARDIS, the Master's TARDIS has a fully functioning chameleon circuit.

Exterior Appearance
The Master's TARDIS chameleon circuit has rendered his TARDIS to appear as:
 * A Horse Box (DW: Terror of the Autons)
 * A White Door (DW: The Claws of Axos)
 * A Space Ship (DW: Colony in Space)
 * Computer Bank (DW: The Time Monster
 * Grandfather Clock (DW: The Deadly Assassin, The Keeper of Traken)
 * Ionic Column (DW:  Logopolis,  Castrovalva, Time-Flight, Planet of Fire)
 * Concorde (DW: Time-Flight)
 * A House within the Matrix (DW: The Ultimate Foe)

Interior
The Master's TARDIS has had a varied interior, his first TARDIS simply had a scanner. (DW: Terror of the Autons) While later interiors seems to mimic the Doctor's re-designs of his own TARDIS. (DW: The Time Monster)

Much of the time it is simply a somber black interior, sometimes with specialist equipment such as the web (which he used to contain Adric). (DW:  Castrovalva)

Specific Systems
Once, the Master tricked the Doctor into materializing his TARDIS around the Master's, creating a dimensionally recursive loop (DW: Logopolis) - repeating a situation that had previously occurred accidentally (DW: The Time Monster'').