説明
A multimeter is the instrument you trust when the reading matters, and trust is built on two things: the input protection and the accuracy of the reference. The BT-39K is an auto-ranging meter built around a 4000-count display with true RMS measurement, which means it reads a distorted waveform as the equivalent heating value rather than as a number that is quietly wrong on anything other than a clean sine wave.
Auto-ranging is not a convenience feature on a bench meter, it is a safety feature. Manual meters invite the mistake of measuring mains voltage on a resistance range, and that mistake destroys the instrument and occasionally the person holding it. Here the meter selects the range, and the input is protected against overload with a fused current path and a high-energy resistor on the voltage input.
The display is backlit with a data-hold function and a continuity beeper fast enough to trace a harness without watching the screen. Capacitance, diode test, frequency and duty cycle cover the checks that come up in repair work, and the case is moulded with a stand and a hanging hook so it can sit upright on a bench with both hands free for probes.
It arrives with test leads, a thermocouple for temperature measurement and a case that keeps the probes from being lost between jobs. For anyone doing fault-finding on mains circuits, automotive harnesses, or a bench full of salvaged electronics, this is the meter that stays on the desk rather than in the drawer.
Measurement you cannot trust is worse than no measurement at all.
What Makes It Different
- ✦True RMS measurement that stays accurate on distorted waveforms
- ✦4000-count display with backlight and data hold
- ✦Auto-ranging with fused current path and protected voltage input
- ✦Continuity beeper fast enough for harness tracing
- ✦Capacitance, diode, frequency and duty cycle functions
- ✦Moulded stand and hanging hook for hands-free bench work
- ✦Ships with leads, thermocouple and protective case
Technical Specifications
- Display4000-count LCD, backlit
- MeasurementTrue RMS, auto-ranging
- DC VoltageUp to 600 V
- AC VoltageUp to 600 V
- ResistanceUp to 40 MOhm
- CurrentAC and DC, fused input
- Extra FunctionsCapacitance, diode, continuity, frequency, duty cycle, temperature
- Input ProtectionFused current path, protected voltage input
- Power9 V battery
- IncludedTest leads, thermocouple probe, carry case
Where It Earns Its Place
Fault-finding on a domestic circuit before calling an electrician. Chasing a parasitic drain on a car battery. Checking a salvaged power supply before it goes into a project. Verifying that a bench supply actually delivers what its dial claims. In every case the requirement is the same: a number that can be acted on without a second opinion.
The EastSupplier Promise
Sourced directly from vetted manufacturing partners, inspected before dispatch, and priced without distributor layers. If the item arrives outside specification, we replace it or refund it. Every listing on this store is curated by a human buyer, not bulk-imported and abandoned.
Questions Buyers Actually Ask
Q: Does it measure true RMS?
Yes. True RMS matters when the waveform is not a clean sine wave, which is most real circuits: switch-mode supplies, dimmers, inverter outputs.
Q: Is it safe for mains voltage work?
It measures up to 600 V AC and DC with a protected input. As with any meter, use correctly rated probes and never work on live circuits alone.
Q: What is included in the box?
Test leads, a thermocouple temperature probe, and a protective carry case.
Q: Can it test capacitors?
Yes, capacitance measurement covers the range needed for start and run capacitors as well as small electronics.
Q: Does it have a continuity beeper?
Yes, with a response fast enough to trace a harness by ear instead of by eye.
Q: Will it auto-power-off?
Yes, the meter sleeps after a period of inactivity, which is what keeps a bench meter from draining a battery between jobs.
Q: Can it measure temperature?
Yes, a thermocouple probe is included and the meter reads temperature directly, which is useful for checking a heatsink, an exhaust port or a supply that is running hotter than it should.
Q: Is the display readable in a dim workshop?
The LCD is backlit, so a reading is legible in a cupboard, under a car, or in a workshop lit by a single lamp.








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