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| Brand | WPI |
|---|---|
| Origin | USA |
| Model | EVOM2 |
| Power Supply | Rechargeable Battery (10 hr runtime) |
| Display | 4.5-digit LCD (1–9,999 Ω) |
| Electrode Interface | STX2 chopstick-style electrodes (4 mm wide × 1 mm thick) |
| Output | Isolated BNC analog output |
| Compliance | CE, RoHS |
| Cell Culture Compatibility | 6-, 12-, 24-, and 96-well Transwell®/HTS plates with permeable supports |
| Measurement Principle | AC-based four-electrode (2-current / 2-voltage) impedance spectroscopy at 12.5 Hz |
| Isolation | Galvanically isolated power architecture prevents electrode polarization, metal deposition, and tissue stimulation |
| Accessories Included | STX2 electrodes, calibration resistor, BNC cable, rechargeable battery pack, carrying case |
| Brand | Chengmeng |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Product Category | Imported Instrument |
| Model | EVOM4 |
| Impedance Range | 0–105,000 Ω (auto-ranging across Low/Mid/High ranges) |
| Sampling Rate | 12.5 Hz |
| Sampling Averaging | 20 samples/sec |
| Current Output | 2 µA / 4 µA / 10 µA (auto/manual mode) |
| Impedance Resolution | 0.1 Ω (<200 Ω), 1 Ω (≥200 Ω) |
| Impedance Accuracy | ±0.1 Ω (<200 Ω) |
| Voltage Resolution & Accuracy | 0.1 mV |
| Display Update Interval | 0.5 s |
| Power | Rechargeable 3.7 V Li-ion battery (2500 mAh) |
| Charging Time | 5.5 h (off), 6 h (on) |
| Charging Current | 200 mA |
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