multimeter review

  • Klein ET600 Megohmmeter: My Hands-On Review

    BySteve

    I’ve been running the Klein ET600 through its paces for six months now, and it’s become my go-to for insulation testing on compressor motors and control circuits. What sets this apart from cheaper combo units is that the megohmmeter function actually works consistently-I’m talking reliable readings at 1000V on aged motor windings, not the flaky numbers you get from budget models. The auto-ranging TRMS multimeter side handles everyday troubleshooting without switching tools, which saves time on service calls. Build quality feels solid; it’s survived a few drops from condenser units already. My only gripe is the test lead storage-there isn’t any-but that’s minor. At this price point, you’re getting legitimate insulation testing capability without dropping cash on a dedicated megger. For HVAC work, it hits the sweet spot.

  • Klein MM420 Review: My Go-To HVAC Multimeter

    ByMike Izzo

    After five years in HVAC, I’ve burned through my share of cheap multimeters. The Klein MM420 changed that. This thing handles everything I throw at it—from checking 24V control circuits to testing compressor windings in hundred-degree attics. The auto-ranging feature saves time when I’m bouncing between voltage checks and resistance readings, and the TRMS actually matters when you’re diagnosing variable-speed equipment. What really sold me was durability. I’ve dropped it off a condenser unit, left it in the rain, and it keeps working. The leads are thick enough to survive daily abuse, and the display stays readable even in direct sunlight. At this price point, you won’t find a tougher, more reliable meter for HVAC work. It’s been in my bag every single day for two years.