A device for an electrochemical measurement of a solution , comprising: a counter electrode (CE) configured to contact the solution ; a reference electrode (RE) configured to contact the solution ; a working electrode (WE) configured to contact the solution ; a voltage generating circuit ; a current measuring circuit connected to the working electrode (WE) ; an operational amplifier having an output (OUT), a non-inverting input (+IN), and an inverting input (-IN), the output (OUT) being connected to the counter electrode (CE) , the inverting input (-IN) being connected to the reference electrode (RE) , and the non-inverting input (+IN) being connected to the voltage generating circuit ; a capacitor having a capacitance of 1 μF or greater; characterised in that it further comprises: a switch circuit having a first input terminal, the second input terminal and the output terminal; and a buffer circuit having an input and an output, wherein the capacitor is connected to the output of the operational amplifier (OUT) and the counter electrode (CE) at one end, and connected to the output terminal of the switch circuit at the other end, wherein the switch circuit is connected to the output terminal of the buffer circuit at the first input terminal, and connected to the inverting input of the operational amplifier (-IN) and the reference electrode (RE) at the second input terminal, wherein the buffer circuit is connected to the inverting input (-IN) of the operational amplifier and the reference electrode (RE) at an input terminal. a counter electrode (CE) configured to contact the solution ; a reference electrode (RE) configured to contact the solution ; a working electrode (WE) configured to contact the solution ; a voltage generating circuit ; a current measuring circuit connected to the working electrode (WE) ; an operational amplifier having an output (OUT), a non-inverting input (+IN), and an inverting input (-IN), the output (OUT) being connected to the counter electrode (CE) , the inverting input (-IN) being connected to the reference electrode (RE) , and the non-inverting input (+IN) being connected to the voltage generating circuit ; the output (OUT) being connected to the counter electrode (CE) , the inverting input (-IN) being connected to the reference electrode (RE) , and the non-inverting input (+IN) being connected to the voltage generating circuit ; a capacitor having a capacitance of 1 μF or greater; a switch circuit having a first input terminal, the second input terminal and the output terminal; and a buffer circuit having an input and an output, wherein the capacitor is connected to the output of the operational amplifier (OUT) and the counter electrode (CE) at one end, and connected to the output terminal of the switch circuit at the other end, wherein the switch circuit is connected to the output terminal of the buffer circuit at the first input terminal, and connected to the inverting input of the operational amplifier (-IN) and the reference electrode (RE) at the second input terminal, wherein the buffer circuit is connected to the inverting input (-IN) of the operational amplifier and the reference electrode (RE) at an input terminal. <EOS>