How to Choose the Best Multifunction Tester (kyoritsu vs fluke)

When electrical professionals look for a multifunction tester (MFT), they aren’t just searching for a device—they’re seeking reliability, precision, and a solution that aligns with ever-evolving safety standards. In a market saturated with options, two models have earned the spotlight: the Fluke 1663 and the Kyoritsu KEW 6516BT. Both are engineered for comprehensive installation testing. Both boast professional-grade functionality. But which one truly delivers the edge?

This comparison will guide electricians, inspectors, and engineers through an evidence-based breakdown of performance, features, and practical application, to help determine which tester best aligns with specific use-case requirements.

what is the best multifunction tester and Why It Matters

A multifunction tester combines various essential measurements—RCD testing, insulation resistance, continuity, loop and line impedance, and more—into a single, portable unit. Designed for compliance with regional and international standards, MFTs are indispensable for efficient, accurate testing during installation and maintenance.

Meet the Contenders: Fluke 1663 and kyoritsu multifunction tester KEW 6516BT

Both units are fully compliant with IEC 61010 safety standards and support a full suite of electrical installation tests. But they differ in execution, design, and specialty features that can tip the scales for professionals depending on their priorities.

Build Quality and Ergonomics

Fluke 1663

• Industrial-grade ruggedness with an IP40-rated casing

• Slightly bulkier, designed for field conditions

• Rotary dial, large buttons, and backlit monochrome LCD

Kyoritsu KEW 6516BT 

• Lightweight and compact design

• Color LCD with intuitive user interface

• Modern housing with protective contours for handheld comfort

If portability and screen readability are priorities, Kyoritsu edges ahead.

Accuracy and Measurement Capabilities

Kyoritsu offers more precise low-resistance loop testing, whereas Fluke provides a broader insulation resistance range and supports Type B RCDs, critical in EV charging and solar applications.

User Interface and Display

• Fluke 1663: Monochrome screen with contextual help. Functional but dated.

• Kyoritsu KEW 6516BT: Full-color LCD with clearer test segmentation and Zs/Ra pass/fail indicators.

The color interface in Kyoritsu allows quicker interpretation—ideal in fast-paced job sites.

Test Automation and Workflow

• Fluke’s Zero Adapter: Simplifies cable compensation, reducing user error.

• Z-Max Memory: Stores highest loop impedance, helping evaluate worst-case scenarios.

• Kyoritsu’s ATT (Anti Trip Technology): Prevents accidental RCD tripping during L-PE loop tests.

• Zs/Ra Limit Check: Instantly shows if a circuit passes standard thresholds.

Kyoritsu excels in automation that simplifies safety verification, while Fluke focuses on eliminating manual errors.

Safety Features and Compliance

Both models are CAT III 500V / CAT IV 300V rated.

• Fluke features live voltage detection, fuse protection, and auto discharge.

• Kyoritsu adds polarity detection alerts and automated RCD ramp testing for detailed diagnosis.

Data Logging and Connectivity

• Fluke 1663: No built-in wireless; data transfer is manual.

• Kyoritsu KEW 6516BT: Equipped with Bluetooth and KEW CONNECT app, enabling fast data export and PDF report generation via mobile or tablet.

For professionals who value digital reporting and mobile integration, Kyoritsu clearly leads.

Advanced Test Features Breakdown

Exclusive to Fluke 1663:

• Type B RCD Testing

• RCD Auto Test + AC/A simultaneous mode

• Z-max memory storage

• Rotary dial simplicity

• Zero adapter for lead compensation

Exclusive to Kyoritsu KEW 6516BT:

• Bluetooth + KEW CONNECT

• SPD (Surge Protection Device) testing

• Zs/Ra limit check with pass/fail indicator

• ATT for no-trip testing

• Color display and graphic menus

Price-to-Performance Comparison

While prices may vary by region, generally:

• Fluke 1663: Higher price point, premium brand reputation, rugged build

• Kyoritsu KEW 6516BT: More affordable, with superior digital features and broader measurement flexibility

Best Use Case Scenarios

Where to Buy Multifunction Tester in the UAE

Both models are available at reputable electrical equipment providers in the UAE.

They offer calibration certificates, express shipping in Dubai & Abu Dhabi, and live support from certified engineers

Local Availability in the UAE

Both the Fluke 1663 and Kyoritsu KEW 6516BT are available for purchase in the UAE through certified distributors and test equipment specialists. For professional electricians working in cities like Dubai, Abu Dhabi, Sharjah, and Al Ain, these testers meet DEWA and IEC standards.

Expert Opinion for UAE Electricians

For professionals working on large industrial sites or EV infrastructure in Dubai, Fluke 1663 offers legacy dependability.

For modern contractors needing speed, automation, and mobile data in residential projects, Kyoritsu 6516BT is a better fit.

Final Verdict Based on Real-World Needs

Both the Fluke 1663 and the Kyoritsu KEW 6516BT are high-performance, regulation-compliant multifunction testers designed for professionals who take safety and efficiency seriously. However, their strengths align with different work styles:

• Choose the Fluke 1663 if your work involves Type B RCD testing, heavy-duty industrial environments, or if you value legacy tool dependability with robust build quality.

• Choose the Kyoritsu KEW 6516BT if you need flexibility, data sharing, digital interfaces, and enhanced test automation for smoother workflows.

The best tester is the one that enhances your precision, protects your clients, and fits seamlessly into your workflow.

Both tools are powerful. The difference lies in what you need them to empower.