Lexmark LEX40X0036 LEXMARK T640-T644 TONER SENSOR ASSEMBLY. Compatable with these models: T640
T640DN
T640DTN
T640N
T640TN
T642
T642DN
T642DTN
T642N
T642TN
T644
T644DN
T644DTN
T644N
T644TN
X642E
X644E
X646DTE
X646E
T640DN
T640DTN
T640N
T640TN
T642
T642DN
T642DTN
T642N
T642TN
T644
T644DN
T644DTN
T644N
T644TN
X642E
X644E
X646DTE
X646E