This refillable microelectrode features Orion’s renowned ROSS technology for fast, accurate, and stable pH readings. Response time is 0.01 pH units in 30 seconds while drift is less than 0.002 pH units per day. Double-junction system makes this microelectrode compatible with Tris buffers and samples containing proteins and enzymes. Non-mercury electrode is a great alternative to calomel-based microelectrodes.