A multimeter is the combination of a DC voltmeter, AC voltmeter, ammeter, and ohmmeter. Auxiliary gauges were restyled and the ammeter was replaced with a voltmeter. Instruments for measuring voltages include the voltmeter, the potentiometer, and the oscilloscope. This voltage is measured, using the same voltage standard and integrating voltmeter. The display consists of a voltmeter, which displays voltage in units of pH. A voltmeter is optional since the applied voltage is the same as the voltmeter reading. Small stray voltages may never be noticed and may only be detected with a voltmeter. These included an IC tester, a waveform generator, a digital voltmeter, and several other instruments. Use of a multifunction tester in the EU or a solenoid voltmeter in the USA. The key feature is the existence of two thermocouples connected to a voltmeter. Some versions use telemetry to connect the electrodes to the voltmeter display device. The 1957 Chevrolets did not have an oil pressure gauge or a voltmeter. A voltmeter negative lead is connected to the test wire. This also has the advantage that it can be measured with a voltmeter. A specialized form of the VTVM or FET-VM is the AC voltmeter.