tool review

  • Klein Tools 935AB4V: My Go-To Torpedo Level

    ByMike Izzo

    After running through countless torpedo levels over the years, I’ve finally found one that doesn’t quit on me. The Klein 935AB4V has become a permanent fixture in my tool bag, and for good reason. That high-vis orange isn’t just for show—when you’re working in dim mechanical rooms or crawl spaces, you can actually spot this thing without playing hide-and-seek with your gear. The magnetic track grabs onto ductwork and conduit like it means business, freeing up both hands when you need them most. What really sold me are those four vial options (0/30/45/90 degrees). Whether I’m checking drain lines or setting up complex duct runs, I’ve got the angle I need without switching tools. The V-groove is clutch for pipe work too. It’s built tough enough to handle real jobsite abuse, and at six inches, it fits perfectly where larger levels won’t.

  • I Tested Klein’s Laser Measure in Real HVAC Work

    ByMike Izzo

    I’ve been crawling through attics and measuring ductwork for over a decade, and I’m done with tape measures that kink up in tight spaces. When Klein Tools sent me their laser distance measure to test, I was skeptical—I’ve seen plenty of gadgets that work great in a warehouse but fail in a sweltering mechanical room. After three weeks of real jobs, from residential service calls to commercial retrofits, this thing’s earned a permanent spot in my bag. It switches between feet, inches, and meters instantly, which saves me from doing math when I’m already sweating through my shirt. The laser holds steady even when I’m balancing on a ladder, and the measurements are dead-on accurate. Is it perfect? No tool is. But it’s made my job measurably easier.

  • Klein Tools Skribes: My Go-To Jobsite Markers

    BySteve

    I’ve been through more marker brands than I can count, and most don’t last a week in my truck. The Klein Tools Skribes are different. These things write on anything — I’m talking condensation-covered evaporator coils, dusty ductwork, even that grimy compressor housing you just degreased. The ink doesn’t fade or smear when you’re sweating through a July attic job, and the fine tip stays sharp long enough to actually matter. I keep one clipped to my shirt and stash the 12-pack in my van because I go through them steady, not from failure but from constant use. They’re not cheap, but neither is my time crawling back to the truck because another garbage marker quit mid-label. These just work.

  • Klein Tools 70550: The Hex Set I Actually Carry

    BySteve

    Look, I’ve bought plenty of hex sets that ended up living in my bottom drawer. The Klein 70550? It’s been on my belt for two years straight.

    What sold me wasn’t the “heavy duty” marketing—it was the first time I folded out that extra-long 5/16″ key and actually reached a blower motor setscrew without pulling the whole unit. The SAE sizing covers about 90% of what I hit on residential calls, and the fold-up design means I’m not fishing loose keys out of my bag while balanced on a ladder.

    These aren’t the cheapest hex wrenches out there, but they’re Klein—which means when I crank down on a seized screw, something’s going to give, and it won’t be the tool. If you run service calls, you need keys you can count on. These are it.

  • Klein 935DGGP: My Go-To Digital Angle Gauge

    BySteve

    After two years of daily use, the Klein 935DGGP has earned its permanent spot in my truck. I’ve tried cheaper angle finders that either lost calibration or couldn’t hold position on ductwork, and I’ve used the pricey options that offer features I’ll never need. This one hits the sweet spot. The magnetic base actually grips—even on painted surfaces—which matters when you’re balancing on a ladder trying to set register angles. What sold me is the quick conversion between degrees and pitch ratios. No more mental math or fumbling with my phone when a customer asks about their roof pitch for condenser placement. It’s accurate, reads clearly in dim attics, and the auto-shutoff saves batteries. Not the cheapest tool out there, but it’s one I actually reach for instead of leaving in the bottom of my bag.

  • Klein 935DAA: My Go-To Level for Ductwork Angles

    BySteve

    I’ve been running duct for over a decade, and I can tell you that eyeballing angles doesn’t cut it anymore—especially when you’re dealing with high-efficiency systems where every degree matters. The Klein 935DAA has become my daily driver for setting proper ductwork slopes and checking equipment level. What sold me is how it handles the real-world stuff: the magnetic base actually holds on greasy plenums, the display stays readable even in dim crawlspaces, and those LED alerts mean I don’t have to squint at tiny bubbles while I’m twisted into some awkward position. It switches between 0-90 and 0-180 ranges fast, which is clutch when you’re setting drain pans one minute and checking blower mounts the next. Is it perfect? No. But it’s tough, accurate, and actually makes my job easier—that’s all I need.

  • Klein D213-8NE: My Go-To Lineman’s Pliers Review

    BySteve

    I’ve been running HVAC calls for over a decade, and I’ve gone through more pliers than I care to count. The Klein D213-8NE changed that. These aren’t just another pair of lineman’s pliers – they’re the ones that actually stay in my pouch instead of getting tossed in the junk drawer after a month.

    What sets these apart is the high-leverage design. When you’re cutting 10-gauge copper in a cramped attic at 110 degrees, that leverage matters. The cutting edges stay sharp through abuse that would dull cheaper pliers in weeks. I’ve used mine for everything from cutting aluminum coil whip to twisting wire nuts, and they handle it without complaint.

    At around $30, they’re not the cheapest option, but they’re the last pair you’ll need to buy for a long time.

  • Klein 32293 Insulated Screwdriver: My Go-To Tool

    ByMike Izzo

    I’ve been carrying the Klein 32293 in my tool bag for two years now, and it’s become the screwdriver I reach for first on almost every service call. The flip blade design means I’m not juggling two separate tools when I’m cramped inside a furnace cabinet or working overhead on a condensing unit. What really matters in this trade is the insulation rating – it’s tested to 1000V, which gives me peace of mind when I’m working around electrical components. The #2 Phillips and 1/4-inch slotted tips fit terminal screws perfectly, no stripping or slipping. The grip stays comfortable even when my hands are sweaty or greasy. It’s not the cheapest option out there, but Klein builds tools that last. I haven’t had to replace mine yet, and it still feels as solid as day one.

  • Klein Tools 80013: My Go-To Crimping Kit Review

    BySteve

    After twenty years pulling wire in attics and crawl spaces, I’ve learned that most combo tool kits are garbage. The Klein Tools 80013 changed my mind. This two-piece setup pairs an automatic wire stripper with a ratcheting crimper, and both actually work like they’re supposed to. The stripper handles 10-22 AWG without mangling the copper—something I deal with daily on thermostat and control wiring. The ratcheting crimper gives you consistent pressure every time, which means reliable connections on insulated terminals. No more guessing if you squeezed hard enough. I’ve been running this kit for eight months now, and it’s held up through residential installs and commercial service calls. Not the cheapest option out there, but it’s Klein—you’re paying for tools that won’t fail when you’re three jobs deep on a Friday afternoon.

  • 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.

  • Klein 85515HD: My Go-To Set for Tight Spots

    BySteve

    I’ve been wrenching on HVAC systems for over a decade, and tight spaces come with the territory. The Klein 85515HD has earned a permanent spot in my bag for one simple reason: it works where other tools can’t. That mini-ratchet gets into furnace cabinets and behind compressors without me having to disassemble half the unit first. The 12-in-1 stubby driver is genuinely useful—not just marketing fluff—and the bits actually stay put under load. What really sold me is the 5-in-1 impact socket set; those deep-well options have saved my bacon more times than I can count on condensing units. This isn’t the cheapest set out there, but Klein built these tough enough to handle daily abuse. If you’re tired of fighting your tools instead of the job, this set is worth every penny.

  • Klein D248-9ST: My Go-To Diagonal Cutters Review

    BySteve

    I’ve been running HVAC service calls for over a decade, and I can tell you straight up: most diagonal cutters marketed to our trade are garbage within six months. The Klein D248-9ST changed that for me. These aren’t your typical wire snips — they’re built like ironworker tools because that’s exactly what they are. I started using them after snapping my third pair of “professional grade” cutters on a condensing unit’s wire loom. The high leverage design means I’m not death-gripping every cut, and yes, I’ve actually used them on rebar when retrofit work gets creative. Made in USA matters here because the steel quality is noticeable. At 9 inches, they fit my tool bag without being awkward. Bottom line: these cutters have survived two years of daily abuse and still bite clean. That’s all I need to know.