| Instek Benchtop Digital Multimeters |  | | |
| 3½ and 4½ Digit Bench Models | | | 
GDM-8034
↓ | 
GDM-8135
↓ | 
GDM-8145
↓ | | Resolution | 3 ½ Digits | 3 ½ Digits | 4 ½ Digits | | Basic Functions | Vdc, Vac, Adc,
Aac, Ω | Vdc, Vac, Adc,
Aac, Ω | Vdc, Vac, Adc,
Aac, Ω | | Special Functions | Cap., Diode Test,
Continuity | Diode Test,
Continuity | Diode Test, AC or
AC + DC True RMS | | Display | LCD | LED | LED | | VDC Basic Accuracy | 0.5% | 0.1% | 0.03% | | Max Current | 20A | 20A | 20A | | True RMS | -- | -- | Yes | | | | | |
| High Accuracy / High Resolution Bench Models | | | 
GDM-8245
↓ |
GDM-8246
↓ | 
GDM-8251A
↓ |
GDM-8255A
↓ | | Resolution | 50000 Counts
(4 4/5 Digits) | 50000 Counts
(4 4/5 Digits) | 120000 Counts
(5 1/2 Digits) | 199999 Counts
(5 1/2 Digits) | | Basic Functions | Vdc, Vac, Adc,
Aac, Ω | Vdc, Vac, Adc,
Aac, Ω | Vdc, Vac, Adc,
Aac, Ω | Vdc, Vac, Adc,
Aac, Ω | | Special Functions | Capacitance, Diode Test,
Hz, Continuity, dBm, Max/Min, Hold, AC+DC TRMS | Capacitance, Diode Test,
Hz, Continuity, REL, dBm, Max/Min, Auto Hold, Compare, AC+DC TRMS | Diode Test, Hz,
Continuity, dBm, REL, Max/Min, Temperature, Compare, AC+DC TRMS | Diode Test, Hz,
Continuity, dBm, REL, Max/Min, Temperature, Compare, AC+DC TRMS | | Autoranging | Yes | Yes | Yes | Yes | | Display | Dual - LED | Dual - LED | Dual - Vacuum Flourescent | Dual - Vacuum Flourescent | | VDC Basic Accuracy | 0.03% | 0.02% | 0.012% | 0.012% | | Ohms Measurement | 2 Wire | 2 Wire | 2 / 4 Wire | 2 / 4 Wire | | Max Current | 20A | 20A | 10A | 10A | | True RMS | Yes | Yes | Yes | Yes | | Std. I/O Interfaces | -- | RS-232C | USB, RS-232C, Special Functions Digital I/O Buss | USB, RS-232C, Special Functions Digital I/O Buss | | Optional I/O | -- | GPIB | -- | -- | | | | | | |
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