TX21 Battery Coulometer 50A/100A/350A LiFePO4 Power Meter
TX21 Battery Coulometer 50A/100A/350A LiFePO4 Power Meter
TX21 Professional Battery Capacity Coulometer — Real-Time Power Monitoring
Take full control of your battery system with the TX21 Battery Capacity Coulometer. Available in 50A, 100A, and 350A versions, this professional-grade digital power display meter accurately tracks voltage, current, power, and capacity (Ah) in real time — making it the ideal monitoring solution for RVs, electric vehicles, solar energy storage systems, emergency power supplies, and more.
Made in Mainland China.
Key Features
- High-Accuracy Measurement: Current measurement precision down to 0.001A with ±1.0% accuracy across voltage, current, and capacity readings.
- Touch-Lock Screen: Easily lock the display to prevent accidental input during operation.
- Auto & Fixed Brightness: Intelligent backlight adapts to ambient light automatically (AUTO mode), or stays at a constant brightness level (FIXED mode) — your choice.
- Bluetooth Connectivity (Android): Connect via the companion Android app to monitor battery data in real time and adjust user parameters remotely.
- Wide Compatibility: Works with RVs, electric bicycles, e-bikes, emergency and energy storage power supplies, and a broad range of battery-powered equipment and instruments.
- Wide Voltage Range: Operates from 8.0V to 120.0V, supporting a wide variety of battery systems including lithium iron phosphate (LiFePO4).
- Broad Capacity Detection: Measures from 0.1Ah to 9999.0Ah — suitable for small packs and large bank systems alike.
Technical Specifications
| Model | TX21 |
| Working Voltage | 8.0 – 120.0V |
| Current Accuracy | ±1.0% |
| Voltage Accuracy | ±1.0% |
| Capacity Accuracy | ±1.0% |
| Capacity Detection Range | 0.1 – 9999.0 Ah |
| 50A Sampler Range | 0 – 75A |
| 100A Sampler Range | 0 – 150A |
| 350A Sampler Range | 0 – 500A |
| Ambient Temperature | -10°C to 60°C |
| Display | Digital Only |
| Display Size | 82 × 58 × 16.3 mm |
| Weight | 50A: 260g | 100A: 340g | 350A: 490g |
| Sleep Power Consumption | 0.3 – 0.7mA |
| Backlight Off Power Draw | 3.4mA |
What's in the Box
- 1× TX21 Coulometer Display Screen
- 1× 3m Shielded Wire
- 1× Sampler (50A, 100A, or 350A — your choice)
- 1× Mounting Base
You Might Also Like
- 25-in-1 Precision Magnetic Screwdriver Set | Pro Repair Kit
- 10-Pack Waterproof Cable Glands PG7 PG9 Nylon Connectors
- 34-Compartment Double-Sided Hardware Storage Box & Dividers
Learn more: ENERGY STAR product efficiency guidance
Frequently Asked Questions
Q: What battery types is the TX21 Coulometer compatible with?
A: The TX21 is designed primarily for lithium iron phosphate (LiFePO4) battery systems, but its wide voltage range of 8.0V–120.0V makes it compatible with many other battery types used in RVs, electric vehicles, solar storage setups, and emergency power systems.
Q: Does the Bluetooth feature work with iOS devices?
A: The Bluetooth connectivity and companion app are currently compatible with Android devices only. iOS is not supported at this time.
Q: Which sampler version should I choose — 50A, 100A, or 350A?
A: Choose based on your system's maximum current draw. The 50A sampler handles up to 75A, the 100A sampler handles up to 150A, and the 350A sampler handles up to 500A. Always select a sampler rated above your system's peak current for safe and accurate readings.
Q: Can the display screen brightness be adjusted?
A: Yes. The TX21 offers two backlight modes: AUTO mode, which adjusts brightness based on ambient lighting conditions, and FIXED mode, which keeps the brightness constant regardless of the environment.