roduct Description
The HK39D TRMS Pocket Auto-Range Digital Multimeter is a compact diagnostic instrument designed for technicians, electricians, maintenance professionals and electronics users who need multiple measurement functions in a portable format.
Its True RMS measuring capability provides dependable AC readings when checking electrical equipment, power supplies and circuits with non-sinusoidal waveforms. The meter supports AC/DC voltage, AC/DC current, resistance, capacitance, frequency, duty cycle and temperature measurement, making it suitable for both general electrical inspection and component-level troubleshooting.
A 4,000-count backlit LCD presents readings clearly in workshops, equipment rooms and other poorly illuminated locations. Non-contact voltage detection and live-wire recognition help users perform preliminary voltage checks, while the built-in flashlight improves visibility around panels, cables and confined work areas.
The HK39D also includes diode testing, audible continuity detection, data hold and automatic power-off. With automatic range selection and a pocket-size 119 × 65 × 30 mm housing, it is a practical everyday multimeter for field service and bench work.
Users who need higher display resolution, 60 MΩ resistance measurement or compatibility with an optional 600 A current clamp can also explore the [HK39F 6,000-count TRMS pocket multimeter](/products/hk39f-trms-pocket-digital-multimeter/).
Key Features and Benefits
- True RMS AC measurement: Helps improve the reliability of readings on variable, distorted or non-linear AC signals.
- Integrated temperature measurement: Covers temperatures from -20°C to 1000°C, making the meter useful for electrical and thermal troubleshooting.
- 4,000-count LCD: Provides clear measurement resolution in a compact handheld instrument.
- Automatic range selection: Simplifies operation by selecting the appropriate measuring range automatically.
- Multiple electrical functions: Measures AC/DC voltage, AC/DC current, resistance, capacitance, frequency and duty cycle.
- Non-contact voltage detection: Allows preliminary detection of energized conductors without direct probe contact.
- Live-wire recognition: Helps identify a potentially energized line during installation and maintenance work.
- Continuity buzzer and diode test: Supports rapid wiring, fuse, switch and semiconductor checks.
- Backlight and flashlight: Improve readability and working-area visibility in dim environments.
- Data hold: Keeps a measurement visible when the display cannot be read immediately.
- Automatic power-off: Reduces unnecessary battery consumption.
- CAT III 600 V rating: Designed for measurements within the stated CAT III 600 V environment and operating limits.
HK39D Technical Specifications
| Measurement | Range | Accuracy |
|---|---|---|
| DC Voltage | 40 mV / 400 mV / 4 V / 40 V / 400 V | ±(0.5% + 3 digits) |
| DC Voltage | 600 V | ±(0.8% + 5 digits) |
| AC Voltage | 40 mV / 400 mV / 4 V / 40 V / 400 V | ±(1.0% + 3 digits) |
| AC Voltage | 600 V | ±(1.2% + 5 digits) |
| DC Current | 400 µA / 4000 µA / 40 mA | ±(1.0% + 5 digits) |
| DC Current | 400 mA | ±(2.0% + 5 digits) |
| AC Current | 400 µA / 4000 µA / 40 mA | ±(1.5% + 5 digits) |
| AC Current | 400 mA | ±(2.0% + 5 digits) |
| Resistance | 400 Ω / 4 kΩ / 40 kΩ / 400 kΩ / 4 MΩ | ±(1.0% + 5 digits) |
| Resistance | 40 MΩ | ±(1.2% + 8 digits) |
| Capacitance | 4 nF / 40 nF | ±(4.0% + 25 digits) |
| Capacitance | 400 nF / 4 µF / 40 µF / 400 µF | ±(4.0% + 15 digits) |
| Capacitance | 4 mF / 40 mF | ±(5.0% + 25 digits) |
| Frequency | 10 Hz / 100 Hz / 1 kHz / 10 kHz | ±(0.5% + 2 digits) |
| Duty Cycle | 0.1%–99.9% | ±(1.2% + 3 digits) |
| Temperature | -20°C to 0°C | ±4°C |
| Temperature | 0°C to 400°C | ±(2.0% + 3 digits) |
| Temperature | 400°C to 1000°C | ±(3.0% + 3 digits) |
| Temperature | -4°F to 50°F | ±5°F |
| Temperature | 50°F to 750°F | ±(2.0% + 5 digits) |
| Temperature | 750°F to 1832°F | ±(3.0% + 5 digits) |
General Specifications
| Item | HK39D Specification |
|---|---|
| Measurement method | True RMS |
| Display | 4,000-count LCD |
| Range selection | Automatic |
| Non-contact voltage detection | Yes |
| Live-wire recognition | Yes |
| Diode test | Yes |
| Continuity buzzer | Yes |
| Data hold | Yes |
| LCD backlight | Yes |
| Built-in flashlight | Yes |
| Auto power-off | Yes |
| Battery test | 1.5 V |
| Safety category | CAT III 600 V |
| Power supply | 2 × 1.5 V AAA batteries |
| Product dimensions | 119 × 65 × 30 mm |
| Product weight | 130 g |
| Carton quantity | 60 pieces |
| Carton dimensions | 47 × 31.5 × 34.7 cm |
| Net/Gross weight | 17.5 kg / 18.5 kg |
Typical Applications
Electrical Installation Inspection
Use the HK39D to check AC/DC voltage, identify live wiring and test continuity during cable installation, socket inspection and electrical equipment servicing.
Electronics and Circuit Troubleshooting
The low-current ranges, resistance measurement, capacitance testing and diode mode make the meter suitable for examining circuit boards, power adapters, electronic components and control circuits.
HVAC and Temperature Diagnostics
Its temperature ranges from -20°C to 1000°C support heating, ventilation and equipment-temperature checks when used with a suitable compatible temperature probe.
Appliance Repair
Technicians can test supply voltage, wiring continuity, switches, fuses, heating elements and capacitors in household or commercial appliances.
Field and Mobile Maintenance
The small housing, backlit display and flashlight make the HK39D convenient for tool bags and on-site servicing where space and lighting are limited.
HK39D vs. HK39F Comparison
| Comparison Point | HK39D | HK39F |
|---|---|---|
| Display count | 4,000 counts | 6,000 counts |
| True RMS | Yes | Yes |
| Maximum AC/DC voltage | 600 V | 600 V |
| Standard maximum DC current | 400 mA | 600 mA |
| Standard maximum AC current | 400 mA | 600 mA |
| Optional clamp measurement | Not specified | Up to 600 A AC, subject to HK19 rating verification |
| Maximum resistance | 40 MΩ | 60 MΩ |
| Maximum capacitance | 40 mF | 60 mF |
| Frequency range | Up to 10 kHz | Up to 10 kHz |
| Duty-cycle measurement | 0.1%–99.9% | 0.1%–99.9% |
| Temperature measurement | -20°C to 1000°C | Not available |
| NCV detection | Yes | Yes |
| Live-wire recognition | Yes | Yes |
| Diode and continuity tests | Yes | Yes |
| Backlight and flashlight | Yes | Yes |
| Safety rating | CAT III 600 V | CAT III 600 V |
| Dimensions | 119 × 65 × 30 mm | 119 × 65 × 30 mm |
| Weight | 130 g | 130 g |
| Best suited for | Electrical, electronics and temperature troubleshooting | Higher-resolution electrical testing and optional clamp-assisted AC current checks |
Which Model Should You Choose?
Choose the HK39D when temperature measurement is part of the job. Its -20°C to 1000°C capability makes it the more suitable option for HVAC servicing, heating-system checks, appliance diagnostics and maintenance tasks that require both electrical and temperature readings.
Choose the HK39F when display resolution, wider resistance and capacitance ranges, or clamp-assisted AC current measurement are more important. Its 6,000-count screen, 60 MΩ resistance range and optional current clamp provide greater flexibility for electrical and electronics diagnostics.
