ATUOTIN Auto-Ranging Digital Multimeter 6000 Counts True RMS
ATUOTIN Auto-Ranging Digital Multimeter 6000 Counts True RMS
ATUOTIN Smart Auto-Ranging Digital Multimeter — 6000 Counts | True RMS | USB-C Rechargeable
Meet the ATUOTIN FS899L Smart Digital Multimeter — the professional-grade, rechargeable testing tool built for homeowners, automotive technicians, HVAC specialists, and electrical professionals alike. With a 6000-count display, True RMS accuracy, and auto-ranging capability, this multimeter delivers laboratory-level precision in a rugged, handheld package.
Key Features
- True RMS Accuracy: A 6000-count display combined with True RMS technology ensures precise measurements of AC/DC voltage, AC/DC current, resistance, capacitance, frequency, temperature, and diode testing — ideal for both linear and non-linear loads.
- Dual Safety Ratings — CAT.III 1000V / CAT.IV 600V: Built for high-energy environments with dual fuse overload protection, guarding against unexpected surges when working on panels, industrial equipment, or automotive circuits.
- Auto-Ranging Operation: Automatically selects the correct measurement range, saving time and reducing user error across a wide measurement spectrum.
- NCV Non-Contact Voltage Detection: Quickly identify live wires without direct probe contact — a fast and convenient safety check for any electrical diagnostic task.
- 4.8-Inch Backlit Display + Built-In Flashlight: The large, high-contrast backlit screen ensures clear, easy readings in any lighting condition. The integrated flashlight illuminates dark workspaces, junction boxes, and engine bays.
- USB-C Rechargeable — Up to 8 Hours Runtime: Say goodbye to disposable batteries. A quick 2-hour USB-C charge powers up to 8 hours of continuous use, keeping you operational in the workshop, on-site, or in the field.
- Data Hold Function: Freeze and review readings at your convenience — perfect for solo diagnostics in tight or awkward spaces.
- Versatile Application: Suitable for home electrical systems, automotive diagnostics, HVAC servicing, industrial equipment checks, and laboratory use.
Full Specifications
| Display | 6000-Count Digital Display |
| Operating Mode | Auto-Ranging |
| AC Voltage | 0.6V – 600V |
| DC Voltage | 0.6V – 600V |
| AC Current | 0.3A – 10A |
| DC Current | 0.3A – 10A |
| Resistance | 600Ω – 60MΩ |
| Capacitance | 10nF – 60mF |
| Frequency | 1 – 10KHz |
| Diode | 3.0V |
| Battery Capacity | 200mAh (USB-C Rechargeable) |
| Charge Time | ~2 Hours |
| Runtime | Up to 8 Hours |
| Color | Red + Black |
| Body Material | ABS |
| Dimensions | 150 × 73 × 25 mm (5.91 × 2.87 × 0.98 in) |
| Safety Rating | CAT.III 1000V / CAT.IV 600V |
| Country of Origin | Made in China |
What's in the Box
- 1 × ATUOTIN FS899L Digital Multimeter
- 1 set × Multimeter Test Probes
- 1 × USB-C Charging Cable
- 1 × Instruction Manual
Safety & Electrical Standards
For guidance on electrical safety best practices when working with voltage testing equipment, visit the OSHA Electrical Safety Resource Center. Additionally, the U.S. Consumer Product Safety Commission (CPSC) provides helpful resources on safe use of electrical testing tools in home and professional settings.
Note: Due to variations in monitor settings and lighting conditions, the actual product color may differ slightly from images. Please allow a 1–2 cm measurement tolerance due to manual measuring methods.
Frequently Asked Questions
Q: What does "True RMS" mean and why does it matter on a digital multimeter?
A: True RMS (Root Mean Square) means the multimeter accurately measures the true effective value of both sinusoidal and non-sinusoidal AC waveforms. Standard "average-responding" meters can give inaccurate readings on variable loads like motors, dimmers, and variable-frequency drives. With True RMS, the ATUOTIN FS899L gives you reliable, accurate data no matter the waveform — essential for modern electronic diagnostics.
Q: Is this digital multimeter safe to use on automotive electrical systems?
A: Yes. The ATUOTIN FS899L is well-suited for automotive electrical diagnostics. It measures DC and AC voltage up to 600V, DC/AC current up to 10A, and includes NCV non-contact voltage detection. Its CAT.III 1000V / CAT.IV 600V dual safety ratings and dual fuse overload protection make it reliable for use on vehicle battery systems, alternators, fuses, and more.
Q: How do I charge the multimeter and how long does the battery last?
A: Charging is simple — connect the included USB-C cable to any standard USB power source and charge for approximately 2 hours to reach a full charge. Once charged, the multimeter provides up to 8 hours of continuous operation, making it practical for all-day use on job sites or extended diagnostic sessions.
Q: Can this multimeter detect live wires without direct contact?
A: Absolutely. The built-in NCV (Non-Contact Voltage) detection feature allows you to identify live or energized wires simply by holding the meter near the wire or outlet — no probes required. This is a fast and convenient way to verify whether a circuit is live before beginning any electrical work.
Q: What is the difference between CAT.III and CAT.IV safety ratings?
A: Measurement Category (CAT) ratings indicate how much transient voltage the meter can safely handle. CAT.III 1000V covers distribution-level circuits like panel boards and building wiring. CAT.IV 600V covers the utility level — outdoor power lines and service entry points. Having both ratings means the ATUOTIN FS899L is rated for a wide range of demanding professional and industrial environments.