How to Choose a Solar PV Tester
Voltage and power range above your panels or strings, an MPPT sweep, a CAT rating, and connectors that fit MC4.
Read Guide→Buying Guides
Research-based buying guides that compare the leading options by documented specifications, real use cases and value.
Best Moisture Meters for Home Inspectors: Pin, Pinless and Dual-Function Picks for Reports
Meters built for inspection reports: the dual-function Protimeter SurveyMaster, the pinless dual-depth Tramex ME5 and the Klein ET140, plus Extech alternatives.
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Best Inspection Cameras With 5-Inch Screens: Standalone Borescopes You Can Read in Daylight
Standalone 5-inch borescopes: the dual-lens Teslong NTS500, triple-lens DEPSTECH DS620 and the TGJOR sewer camera, sorted by lenses, probe length and recording.
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How to Choose a Solar Irradiance Meter
A silicon sensor that sees what panels see, a range past 1,200 W/m², a level and a tilt reading, and a cosine-corrected head.
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How to Choose a Whole-Home Energy Monitor
Per-circuit clamps beat disaggregation, the panel install needs an electrician, and the data should be exportable and ideally local.
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Best Wireless Borescopes: Wi-Fi Inspection Cameras That Use Your Phone as the Screen
Phone-as-screen scopes compared: the Klein ET21 with a stated 30 ft Wi-Fi range, the 1080P auto-focus Klein ET30 and the 3.9 mm NIDAGE wireless.
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How to Choose a Plug-In Electricity Usage Monitor
Accurate to a watt, a kWh counter that survives unplugging, the right plug and rating, and an app only if you will use it.
Read Guide→Best Dual-Lens Borescopes: Forward and Side-View Cameras Compared
Two-camera scopes compared: the Teslong NTS500 with a 0.21 in tip, the DEPSTECH DS650 that adds 210-degree articulation, and the 16.5 ft DEPSTECH DS300.
Read Guide→How to Measure Appliance Power Consumption
A plug-in meter for anything with a plug, a clamp for anything hard-wired, and a day of logging for anything that cycles.
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Best Borescopes for Plumbing and Drains: Waterproof Picks for Traps, Stacks and Sewer Lines
IP67 inspection cameras for wet work: the TGJOR 5-inch sewer camera with a 16.4 ft probe, the Teslong NTS500 dual lens and the DEPSTECH DS300 that records.
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How to Test Continuity With a Multimeter
Circuit dead, continuity mode, probes on the two ends, listen for the beep. Ten common tests and what silence means.
Read Guide→Best Borescopes for Home Inspection: Picks for Wall Cavities, Attics and Crawl Spaces
Cameras for confirming what the thermal camera flagged: the Teslong NTS500 through a small hole, the wireless Klein ET30 on a fish rod and the DEPSTECH DS300.
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