Anyone who has spent a day fault-finding around a switchboard knows the routine — swap leads for the insulation tester, swap again for the earth tester, then reach for the multimeter to confirm the circuit’s dead. Three instruments, a tangle of leads, and a real risk of triggering an RCD trip the moment a small test current sneaks down the earth path. On a busy commercial fit-off or a rooftop solar job, that lost time adds up fast, and a nuisance trip can mean climbing back into the roof space to reset a board.

For Australian trades working to AS/NZS 3000, insulation resistance and earthing checks aren’t optional — they’re the backbone of safe verification. The challenge has always been doing them quickly, accurately and without dragging a kit bag of separate testers up a ladder.

The Solution: Three Tests, One Pocket-Sized Probe

The KEW 6041BT collapses that whole workflow into one palm-sized tester you can hold like a pen. Press the tip to the conductor, hit TEST, and you’ve got insulation resistance, earth resistance or voltage at a glance. KYORITSU built it around a simple idea — get the technician released from test-lead hassles — and the result is an instrument that’s genuinely faster to use on real jobs.

It measures insulation resistance across four ranges (50, 125, 250 and 500 V), checks earth resistance using a simplified 2-pole method, and reads True RMS voltage up to 440 V AC/DC with automatic AC/DC detection. A built-in illuminance sensor wakes the LED light and backlight in dim plant rooms, and glow-in-the-dark switches help you find the controls when you’re working in a dark roof cavity. Crucially, the earth function uses a test current of 2 mA or less, so you can take earth readings on live installations without unintentionally tripping the RCD.

Key Features and What They Mean on the Job

• All-in-one probe design – Insulation, earth and voltage testing in a single 230 g body you operate one-handed. Less gear in the bag, fewer leads to swap, faster results between points.
• Anti-trip earth testing (≤2 mA) – The low test current on the earth function avoids unintentional RCD trips, so you keep measuring on live boards without resetting protection devices.
• Live circuit warning – On both insulation and earth functions, an audible alert plus a red LCD backlight flag dangerous voltage (30 V or higher) and lock out measurement until it’s safe. A built-in safeguard before you apply test voltage.
• True RMS voltage to 440 V – Accurate readings on distorted waveforms common around VSDs, inverters and switching loads, with AC/DC auto-detection so there’s one less setting to get wrong.
• Comparator function with audible pass/fail – Set a threshold and the tester beeps and lights up when a reading falls outside it, so you can run repetitive checks without squinting at every value.
• Auto-discharge – Stored charge on the circuit under test is automatically bled off after an insulation test, protecting you and the equipment.
• Bluetooth 5.0 to KEW Smart Advanced – Save readings straight to your phone or tablet, capture location data, and drop results into the supplied Excel report template — paperwork done before you’ve packed up.
• App-based customisation – Disable ranges or functions you don’t use, change the maximum displayed value, or adjust comparator thresholds to suit your workflow and reduce the chance of accidental high-voltage output.
• Replaceable metal tips – Standard, long and moulded tips are available, plus an optional L-shaped probe for awkward, high or recessed terminals.

Technical Specifications

Specifications are drawn from KYORITSU’s published product data. If you need a full datasheet or instruction manual before purchasing, get in touch and we’ll send it through.

Who It’s For – Real-World Applications

Electrical contractors and sparkies: Run insulation resistance and earth checks during fit-off, fault-finding and periodic verification without lugging separate testers. The probe design and live-circuit lockout make point-to-point testing around a switchboard quick and safe.

Solar PV installers: Carry one compact instrument up to the roof for quick insulation and voltage confirmation on DC and AC sides, with True RMS handling inverter-related waveform distortion. Bluetooth logging means commissioning notes are captured on the spot.

Industrial and facility maintenance teams: Keep a 6041BT in the toolbox for fast spot-checks on motors, control panels and machinery. The anti-trip earth function lets you verify earthing on running plant without dropping protection, and the comparator’s audible pass/fail speeds up repetitive routine inspections.

HVAC and building services technicians: Confirm circuits are dead, check insulation on plant wiring, and verify earthing on rooftop and plant-room equipment — all from one pocketable tool with a light built in for dark mechanical spaces.

TAFE, RTOs and training departments: A safe, simple, app-connected tester that teaches insulation, earth and voltage testing fundamentals, with reporting features students will meet in the field.

What is the KYORITSU KEW 6041BT used for?

The KYORITSU KEW 6041BT is a palm-sized 3-in-1 tester used to measure insulation resistance (50/125/250/500 V), earth resistance (2-pole method, up to 2000 Ω) and True RMS voltage (up to 440 V AC/DC). Electricians, solar installers and maintenance technicians use it for fast, compliant safety testing on site without carrying three separate instruments.

Does the KEW 6041BT prevent RCD nuisance tripping?

Yes. On the earth resistance function the KEW 6041BT uses a test current of 2 mA or less, which is low enough to take earth readings on live installations without unintentionally tripping RCDs. This lets technicians measure on energised boards without resetting protection devices.

Can the KEW 6041BT measure earth resistance without driving stakes into the ground?

Yes. The KEW 6041BT is a simplified earth resistance tester that uses the 2-pole measurement method with existing low-resistance earth systems — such as buried metal water pipes, the common earth of the commercial supply, or a building’s lightning electrode. It’s designed for situations where auxiliary earth stakes can’t be driven, like urban or concrete sites.

Is the KEW 6041BT suitable for AS/NZS 3000 insulation testing?

The KEW 6041BT provides a 500 V DC insulation test range and reads insulation resistance up to 200 MΩ, supporting the insulation resistance verification carried out under the AS/NZS 3000 Wiring Rules. It is rated CAT IV 150 V / CAT III 300 V and built to the IEC 61557 series that underpins Australian testing practice. Always follow the current edition of AS/NZS 3000 and your verification procedures.

Does the KEW 6041BT connect to a phone?

Yes. The KEW 6041BT has Bluetooth 5.0 and works with the free KEW Smart Advanced app for Android and iOS. You can view live readings, save measured data in CSV, capture location information, and transfer results into an Excel report template to generate test reports on site.

How accurate is the KEW 6041BT?

Insulation resistance accuracy is ±2% rdg ±2 dgt in the first effective range, earth resistance is ±3% rdg ±5 dgt, and voltage is ±1% rdg ±4 dgt on AC (True RMS). These tolerances make it dependable for routine compliance pass/fail decisions.

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