A probe device includes a first receiving terminal configured to receive a multi-level signal having M levels, where M is a natural number greater than 2; a second receiving terminal configured to receive a reference signal; a receiving buffer including a first input terminal connected to the first receiving terminal, a second input terminal connected to the second receiving terminal, and an output terminal configured to output the multi-level signal based on signals received from the first and second input terminals; and a resistor circuit comprising a plurality of resistors connected to the first and second receiving terminals and determining a magnitude of a termination resistance of the first and second receiving terminals.