Testboy TB 318 Digital Handheld Multimeter CAT IV 1000 V True RMS for PV Systems

Electrical professionals working on photovoltaic installations, industrial power systems, or high-energy circuits need a measurement tool that delivers both safety and precision. The Testboy TB 318 Digital Handheld Multimeter is built to handle demanding environments with a CAT IV 1000 V safety rating, ensuring reliable performance even on the most critical connections. Its True RMS technology provides accurate readings for both sinusoidal and non-sinusoidal waveforms, making it an indispensable instrument for modern electrical diagnostics.

Who is it for

This multimeter is ideal for electricians, solar technicians, maintenance engineers, and field service professionals who require a rugged, high-category instrument. Whether you are commissioning PV arrays, troubleshooting industrial machinery, or verifying power quality, the TB 318 delivers the confidence needed to work safely and efficiently.

Main features

• True RMS measurement for precise AC voltage and current readings on distorted waveforms
• CAT IV 1000 V / CAT III 1000 V safety rating for use on high-energy circuits
• 6000-count LCD with backlight for clear visibility in low-light conditions
• Auto-ranging function for fast and convenient measurements
• Non-contact voltage (NCV) detection for quick safety checks
• Data hold to freeze readings on the display
• Built-in continuity test with acoustic signal and diode test
• Temperature measurement with K-type probe from -20°C to 1000°C
• Powered by a standard 9V block battery for easy replacement

Specifications

• DC voltage range: 0.1 mV to 1000 V
• AC voltage range: 0.1 mV to 1000 V
• DC current range: 0.1 µA to 10 A
• AC current range: 0.1 µA to 10 A
• Resistance range: 0.1 Ω to 60 MΩ
• Capacitance range: 0.01 nF to 60 mF
• Frequency range: 0.001 Hz to 10 MHz
• Temperature range: -20°C to 1000°C (with K-type probe)
• Display: 6000-count LCD with backlight
• Safety rating: CAT IV 1000 V / CAT III 1000 V
• Power supply: 9V block battery
• Product type: Digital handheld multimeter

Tips

To extend battery life, turn off the backlight when not needed and switch the multimeter off after each session. For temperature measurements, always use a compatible K-type thermocouple and allow the probe to stabilise for accurate readings. When working on PV systems, verify that the circuit is de-energised before connecting the test leads, and use the NCV function as a preliminary check.