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The ZM-104 from TOA Electronics is a portable impedance meter that can measure the impedance of speaker lines up to 100 k ohms. It has an adjustable zero for accuracy on all ranges. It runs on four "AA" batteries and has an easy-to-read meter that calibrates directly in ohms. It includes a carrying case, test leads, and impedance-to-power reference chart.
| Reading Method | Direct |
| Measurement Range |
x 1 Range: 5-1000 ohms x 10 Range: 50-10000 ohms x 100 Range: 500-100,000 ohms |
| Oscillation Frequency | 1kHz (+/-10%) |
| Accuracy | +10% |
| Hard Disk Space | 4 x "AA" Batteries (6V) |
| Service Life |
x 1 Range: 30 Hours x 10, x 100 Range: 60 Hours |
| Dimensions (WxDxH) | 4.5 x 7.3 x 2.2" (115 x 186 x 55 mm) |
| Weight | 2.1 lbs (960 g) (With Batteries) |