| Model | 
1655A | 
1653A | 
1510 | 
1506 | 
1504 | 
1503 |
| Description | AC Power Supply, 0-150V, 0-2A, Analog Display | AC Power Supply, 0-150V, 0-2A, 0-4A, Analog Display | Discharge Tube Power Supply, AC/DC, Analog Display | Power Supply, Regulated AC / DC, Five Outputs, 0-12VDC, 0-12VAC, 0-115VAC, 2A | Power Supply, AC / DC, 12VAC, 1-12VDC, 400mA | Power Supply, AC / DC, 12VAC, 1-12VDC, 5A, Analog Display |
| Output (Volts) | 0-150VAC | 0-150VAC | 0-20VDC; 0-80VDC; 0-500VDC; 1.1, 2.2, 3.3, 4.4, 5.5, 6.6VAC | Two 0-12VAC; Two 0-12VDC; One 0-115VAC | 0-12VAC; 0-12VDC | 0-12VAC; 0-12VDC |
| Output (Amps) | 0-2A, 0-4A | 0-2A | 20V: 5A, 80 and 500V: 10mA; AC: 2A | 2A | 5A | 5A |
| Metering | Single Analog | Single Analog | Dual Analog | Single Analog | None | Dual Analog |
| Manufacturer's Warranty | 1-year | 1-year | 1-year | 1-year | 1-year | 1-year |