Megger MJ159 Major Megger Insulation Resistance Tester

• Measurements: Insulation resistance (0-2000 MΩ, ±1.25% fsd, 100/250/500/1000 V DC), low resistance (0.1-5000 Ω, ±1.25% fsd), AC voltage (20-600 V, ±2.5% fsd). 

• Functionality: Hand-cranked generator (130-170 rpm) for stable DC test voltage (+30%/-0% at 250/500/1000 V, +40%/-0% at 100 V), guard terminal to eliminate surface leakage, automatic discharge (<42.4 V in 4 s for 1 µF), large analogue scale, safety voltage indication. 

• Design: 1 kg, CAT III 300 V, operates -10 °C to 50 °C, hand-cranked (no batteries), 213 x 124 x 128 mm, impact-resistant ABS case, IP54, fused protection (500 mA, 7 A). 

• User-Friendly: Portable with fold-down handle, easy-to-read 71.1 mm arc scale, no scale multipliers, monitors discharge, fused test leads available for high-energy systems. 

• Complete Kit: MJ159 tester, test lead set (3 leads, prods, clips), power cord, test record cards (5), carrying case, user guide, one-year warranty. 

 The Megger MJ159 Major Megger Insulation Resistance Tester is a portable, hand-cranked instrument for testing insulation resistance (0-2000 MΩ, ±1.25% fsd) at 100, 250, 500, and 1000 V DC, low resistance (0.1-5000 Ω, ±1.25% fsd), and AC voltage (20-600 V, ±2.5% fsd). Designed for motors, cables, and transformers, it features a stable test voltage via a hand-cranked generator (130-170 rpm), a guard terminal to eliminate surface leakage, and automatic discharge for safety (<42.4 V in 4 s for 1 µF). Rated CAT III 300 V, the 1 kg tester operates in -10 °C to 50 °C, housed in a rugged ABS case (213 x 124 x 128 mm, IP54) with fused protection.

Compliant with IEC 61010-1, its large 71.1 mm analogue scale ensures clear readings, ideal for spot/step-voltage testing and maintenance. The kit includes the MJ159, test leads, power cord, test record cards, carrying case, user guide, and a one-year warranty, perfect for industrial and domestic electrical diagnostics.