Two and three-electrode electrochemical test cells based on low cost and readily available Conflat vacuum fittings are described. Two-electrode Conflat cells were found to have the same performance as two-electrode coin cells at room temperature, while three-electrode Conflat cells are much easier to assemble than three-electrode coin cells. Such cells maintain good stack pressure, tolerate high vapor pressure solvents and can operate at temperatures up to 200 degrees C. Conflat cells are especially useful for high temperature and magnesium battery research, where the need for three-electrode cells operated at elevated temperatures with volatile solvents makes the use of coin cell hardware impractical. (C) 2014 The Electrochemical Society. All rights reserved.