中國臺灣固緯（GW instek) GDM-451 系列:
特點：
◆ 4 1/2 Digits 19999 counts
◆ Manual Ranging
◆ Continuity Check/Diode Test
◆ Data Hold
◆ Temperature Measurement
◆ Capacitance, Frequency Measurement
規格：
| DC VOLTAGE | |
| Range | 200mV, 2V, 20V, 200V, 1000V |
| Best Accuracy | ∮(0.05%rdg + 3 digits) |
| Input Impedance | 10M |
| AC VOLTAGE (40Hz ~ 400Hz) | |
| Range | 2V, 20V, 200V, 750V |
| Best Accuracy | ∮(0.5%rdg + 10 digits) |
| Input Impedance | 2M |
| DC CURRENT | |
| Range | 2mA, 20mA, 200mA, 20A |
| Best Accuracy | ∮(0.5%rdg + 5 digits) |
| AC CURRENT (50Hz ~ 400Hz) | |
| Range | 20mA, 200mA, 20A |
| Best Accuracy | ∮(0.8%rdg + 10 digits) |
| RESISTANCE | |
| Range | 200 ~ 200M 7 ranges |
| Best Accuracy | ∮(0.3%rdg + 1 digit) |
| CONTINUITY BEEPER | |
| ? | Buzzer sounds if conductance less than 70 |
| DIODE TEST | |
| Open Circuit Voltage | approx. 2.8V typical |
| CAPACITANCE | |
| Range | 2nF, 20nF, 2F, 20F |
| Best Accuracy | ∮(3%rdg + 40digits) |
| FREQUENCY | |
| Range | 1Hz ~ 20kHz |
| Best Accuracy | ∮(1.5%rdg + 5 digits) |
| TEMPERATURE() | |
| Range | -40~1000 |
| Best Accuracy | ∮1% + 30 |
| LCD DISPLAY | |
| | 4 1/2 digits |
| POWER SOURCE | Single 9V battery (6F22) |
| ACCESSORIES | |
| | Instruction manual |
| DIMENSIONS & WEIGHT | 80(W) x 165(H) x 38.3(D) mm |
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