TOOLTOP IR502 Battery Internal Resistance Tester – ±120V, 500Ω, 4-Wire Kelvin
The TOOLTOP IR502 measures a battery's internal resistance and voltage together, the quickest way to grade lithium 18650 and LiFePO4 cells, check lead-acid and NiCd batteries, and match cells before building a pack.
It reads internal resistance from 0.000mΩ to 500Ω using a 1kHz AC signal and four-wire Kelvin probes, and voltage up to ±120V DC (non-polarised). Six resistance ranges switch automatically, the 3.2-inch screen shows both readings at once, and it charges from a built-in 1200mAh lithium battery.
Key Features
- 🔋 Internal resistance 0.000mΩ to 500Ω, 6 ranges with auto switching
- ⚡ Voltage 0.00 to ±120V DC, non-polarised
- 🎯 4-wire Kelvin, 1kHz AC test signal
- 🖥️ 3.2-inch screen showing resistance and voltage together; user self-calibration
- 💡 Backlight and LED torch; built-in 1200mAh lithium battery
Technical Specifications
| Model | IR502 |
|---|---|
| Brand | TOOLTOP |
| Voltage | 0.00V to ±120V |
| Internal resistance | 0.000mΩ to 500Ω |
| Max input voltage | DC 120V (non-polarised); no AC input |
| Measurement current | 50mA to 50µA AC |
| Test frequency | 1kHz |
| Measurement speed | 3 times per second |
| Range selection | Automatic / manual |
| Display | 3.2-inch, dual reading, backlit |
| Power | Built-in 1200mAh lithium battery |
| Battery types | Lead-acid, lithium, nickel-cadmium, alkaline and more |
What's in the Box
- 1 × TOOLTOP IR502 tester