NJTY T21D Digital Multimeter 6000 Counts Auto-Range Voltmeter
NJTY T21D Digital Multimeter 6000 Counts Auto-Range Voltmeter
NJTY T21D Digital Multimeter — 6000-Count Auto-Range Precision Tester
The NJTY T21D Digital Multimeter is a professional-grade, multi-function measurement instrument engineered for high accuracy, fast response, and dependable safety. Whether you're an electrician, electronics hobbyist, HVAC technician, or DIY enthusiast, this versatile tester handles virtually every measurement task you'll encounter — all from a single, compact device.
Powered by a specialized IC with 6000-count resolution, it integrates a high-precision A/D converter and high-speed digital processor capable of true RMS calculation for AC signals up to 1 kHz. The result: stable, accurate readings and long-term calibration consistency you can rely on job after job.
Made in Mainland China.
What Can the T21D Measure?
- AC & DC Voltage: 600 mV – 600 V
- AC & DC Current: 60 mA – 10 A
- Resistance: 600 Ω – 60 MΩ
- Capacitance: 60 nF – 100 mF
- Frequency: 9.99 Hz – 9.99 MHz
- Temperature: -20°C to 1000°C
- Diode Test & Circuit Continuity
Key Features
- 🔢 6000-Count Digital Display — high-resolution backlit LCD for clear readings in any lighting condition, including dimly lit workspaces
- ⚡ Auto-Range Mode — automatically selects the correct measurement range, eliminating manual dial guesswork
- 🌡️ Wide Temperature Range — measures from -20°C to 1000°C for thermal diagnostics and environmental checks
- 🛡️ CE & RoHS Certified — meets European safety and environmental compliance standards
- 🔋 Low Battery Indicator — alerts you before power runs out mid-measurement
- ➕➖ Auto Polarity Display — automatically shows positive/negative input polarity
- 🔒 Overload Protection — "OL" displayed on screen; fuse-protected mA range (F 600 mA/250 V) and A range (F 10 A/250 V)
- 📐 Compact & Lightweight — 147 mm × 71 mm × 45 mm, ~220 g (batteries excluded) — easy to carry to any job site
Full Technical Specifications
| Model | T-21D |
| Display | 6000-count backlit digital display |
| AC Voltage | 600 mV – 600 V |
| DC Voltage | 600 mV – 600 V |
| AC Current | 60 mA – 10 A |
| DC Current | 60 mA – 10 A |
| Resistance | 600 Ω – 60 MΩ |
| Capacitance | 60 nF – 100 mF |
| Frequency | 9.99 Hz – 9.99 MHz |
| Temperature | -20°C to 1000°C |
| Operating Temperature | 0°C – 40°C (<80% RH) |
| Storage Temperature | -10°C – 60°C (<70% RH) |
| Max Voltage (Input to Ground) | 600 V |
| Conversion Rate | ~3 readings/second |
| Safety Rating | 600 V CAT II, Pollution Grade 2 |
| Battery | 3 × 1.5 V AAA (not included) |
| Dimensions | 147 mm × 71 mm × 45 mm |
| Weight | ~220 g (without batteries) |
| Certifications | CE, RoHS |
| Origin | Made in Mainland China |
In the Box
- 1 × NJTY T21D Digital Multimeter
- Test leads & probes
- Note: 3 × AAA batteries not included
Electrical Safety Reference
For best practices when working with electrical measurement tools, refer to the OSHA Electrical Safety guidelines to ensure safe handling and proper use in professional and DIY environments.
Frequently Asked Questions
Q: Does the NJTY T21D Digital Multimeter come with batteries?
A: No, the T21D multimeter requires 3 × 1.5 V AAA batteries which are not included in the box. Simply insert standard AAA batteries before first use. A low-battery indicator on the display will alert you when replacement is needed.
Q: What is the maximum voltage this digital multimeter can safely measure?
A: The NJTY T21D can measure up to 600 V AC or DC, and is rated at 600 V CAT II, Pollution Grade 2 — suitable for household wiring, appliances, and general electrical diagnostics. Always follow safe measurement practices.
Q: Does the T21D multimeter support auto-ranging?
A: Yes! The T21D operates in Auto-Range mode, which means it automatically detects and selects the appropriate measurement range for voltage, current, resistance, capacitance, and frequency — saving you time and reducing the chance of incorrect range selection.
Q: Can I measure temperature with this multimeter?
A: Absolutely. The NJTY T21D includes a temperature measurement function with a range of -20°C to 1000°C, making it useful for HVAC diagnostics, electronics troubleshooting, and industrial applications.
Q: Is the NJTY T21D multimeter certified for safety?
A: Yes. The T21D holds both CE and RoHS certifications, confirming it meets European electrical safety standards and is manufactured without hazardous substances — giving you confidence in both safety and environmental responsibility.