Return to List Altek Process Calibrators 08/08/2003 The well known Altek line of process calibrators is now in stock at Weschler Instruments. These portable calibrators provide digital accuracy and analog ease-of-use. Versatile multi-function and economical single function models are available. Use Altek calibrators to simulate and measure loop currents, voltages, thermocouples, RTDs, frequency and pressure. More Info