Keithley:
| Model | Date | Group | Description |
|---|---|---|---|
| 135 | Digital multimeter | ||
| 147 | 1972 | Other | Nanovolt Null Detector |
| 148 | 1975 | Analog multimeter | Nanovoltmeter |
| 149 | Analog multimeter | MILLI-MICROVOLTMETER | |
| 150 | Digital multimeter | Micro Voltmeter | |
| 150A | 01 January 1964 | Analog multimeter | Microvolt Ammeter |
| 150AR | 01 January 1964 | Analog multimeter | Microvolt Ammeter |
| 150B | 01 January 1967 | Digital multimeter | Microvolt Ammeter |
| 150R | Digital multimeter | ||
| 151 | 1960 | Analog multimeter | Micro Voltmeter |
| 153 | 1974 | Analog multimeter | MICROVOLT-AMMETER |
| 155 | 01 July 1978 | Digital multimeter | Null Detector / Microvoltmeter |
| 160 | 01 May 1976 | Digital multimeter | |
| 1602B | 1975 | Digital multimeter | Digital Output |
| 160B | 1975 | Digital multimeter | |
| 163 | 01 May 1976 | Digital multimeter | |
| 164 | 1974 | Digital multimeter | |
| 164TT | 1974 | Digital multimeter | |
| 165 | 01 January 1975 | Digital multimeter | |
| 168 | 01 January 1974 | Digital multimeter | Autoranging DMM |
