It´s so easy to build it up ...

... and it works so good. You have never seen better cvs!

Just use two OPA 111 (Burr Brown), a 10 nF as capacity and a big resistor (100 MOhm, even bigger). For Redoxpotential (IN) for very small currents, lower than 10 nA, you just connect it to the referenz elctrode. For higher currents you will need one more of the wonderful Burr Brownies, and some wires. Enjoy this precise, easy to build up and good working curcit for electrochemistry current measurements. If you enjoyed it, just give me a reponse....