The HK39F TRMS Pocket Auto-Range Digital Multimeter combines a high-resolution 6,000-count display with everyday electrical testing functions in a lightweight, portable body. It is intended for electrical maintenance, equipment servicing, electronics inspection and field diagnostics where clear readings and broad resistance or capacitance coverage are important.
The instrument measures AC/DC voltage up to 600 V, direct current up to 600 mA and alternating current up to 600 mA through its standard meter inputs. It can also measure AC current up to 600 A when used with the optional HK19 current clamp probe. This expandable current-measurement capability allows the HK39F to cover tasks ranging from low-current electronic circuits to larger AC conductors without placing the multimeter directly in series with the load.
Its 60 MΩ resistance ceiling and capacitance range up to 60 mF make it well suited to component testing, insulation-related diagnostic comparisons and maintenance checks involving larger capacitors. Frequency and duty-cycle functions provide additional information when inspecting control signals and electrical outputs.
For fast day-to-day work, the HK39F includes automatic ranging, True RMS measurement, NCV detection, live-wire recognition, diode test, audible continuity, data hold, LCD backlight and an integrated flashlight. The meter is powered by two AAA batteries and weighs approximately 130 g.
Key Features and Benefits
- 6,000-count display: Offers finer displayed resolution than a standard 4,000-count pocket meter.
- True RMS technology: Supports more dependable AC testing on both conventional and non-linear electrical loads.
- Optional 600 A AC clamp measurement: Extends the meter’s application range when paired with the HK19 current clamp probe.
- Resistance measurement up to 60 MΩ: Useful for inspecting high-value resistors and comparing resistance conditions in electrical assemblies.
- Capacitance capacity up to 60 mF: Supports testing across nanofarad, microfarad and millifarad ranges.
- 600 V AC/DC voltage capability: Covers common electrical maintenance and equipment-diagnostic requirements.
- Automatic ranging: Reduces manual range changes and makes routine measurements faster.
- NCV and live-wire functions: Assist with locating potentially energized wires before direct testing.
- Continuity and diode modes: Enable quick checks of cables, contacts, fuses and semiconductor junctions.
- Hold, backlight and flashlight functions: Improve usability inside cabinets and restricted working spaces.
- Compact 130 g construction: Easy to carry as part of a mobile service toolkit.
- CAT III 600 V classification: Intended for use within its marked category, voltage and manufacturer-specified operating conditions.
HK39F Technical Specifications
| Measurement | Range | Accuracy |
|---|---|---|
| DC Voltage | 60 mV / 600 mV / 6 V / 60 V | ±(0.5% + 5 digits) |
| DC Voltage | 600 V | ±(0.8% + 5 digits) |
| AC Voltage | 60 mV / 600 mV / 6 V / 60 V | ±(1.0% + 3 digits) |
| AC Voltage | 600 V | ±(1.2% + 5 digits) |
| DC Current | 600 µA / 6000 µA / 60 mA | ±(1.0% + 5 digits) |
| DC Current | 600 mA | ±(2.0% + 5 digits) |
| AC Current | 600 µA / 6000 µA / 60 mA | ±(1.5% + 5 digits) |
| AC Current | 600 mA | ±(2.5% + 5 digits) |
| AC Current with optional clamp | Up to 600 A | ±(2.5% + 5 digits) |
| Resistance | 600 Ω / 6 kΩ / 60 kΩ / 600 kΩ / 6 MΩ | ±(1.0% + 5 digits) |
| Resistance | 60 MΩ | ±(1.2% + 8 digits) |
| Capacitance | 1 nF / 10 nF | ±(4.0% + 25 digits) |
| Capacitance | 100 nF / 1 µF / 10 µF / 100 µF | ±(4.0% + 15 digits) |
| Capacitance | 1 mF / 60 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) |
General Specifications
| Item | HK39F Specification |
|---|---|
| Measurement method | True RMS |
| Display | 6,000-count LCD |
| Range selection | Automatic |
| Standard AC current range | Up to 600 mA |
| Clamp-assisted AC current | Up to 600 A with optional HK19 probe |
| 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 |
| Temperature measurement | No |
| 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 |
Optional HK19 Current Clamp Probe
| Item | Specification |
|---|---|
| Jaw opening | 30 mm |
| AC current ranges | 600 mV / 600 A |
| Output | 100 mV/100 A AC; 10 mV/10 A AC; 1 mV/1 A AC |
| Safety rating | CAT II 600 V / CAT III 300 V |
| Maximum rated current | AC 20 A, as stated in the supplied specification image |
| Application | Optional accessory for compatible digital multimeters |
Specification review note: The supplied HK19 table separately states “600 mV/600 A” and “Max Rated Current AC 20 A.” These two statements appear potentially inconsistent. Confirm the clamp’s official manual or engineering data before publishing the maximum-current claim.
Typical Applications
Distribution Panel Checks
With suitable probes and safe working practices, the HK39F can be used to measure voltage, locate live conductors and check continuity in distribution and control panels.
Clamp-Assisted AC Current Inspection
The optional HK19 probe allows current to be measured around a conductor without opening the circuit, subject to the probe’s verified current rating and operating instructions.
Electronic Component Testing
Its 6,000-count display, 60 MΩ resistance capacity and 60 mF capacitance range support detailed checking of resistors, capacitors, diodes and low-current circuits.
Power Supply and Control-System Maintenance
Frequency, duty-cycle and True RMS functions help technicians evaluate power outputs and basic control signals in equipment-maintenance environments.
Workshop and On-Site Service
The backlight, flashlight, auto-range operation and compact dimensions make the HK39F useful for repair benches, toolboxes and mobile service calls.
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.
