Clamp meters and voltage testers: what they measure and when to use them.
As an Amazon Associate we earn from qualifying purchases. Details A clamp meter measures current by opening its jaws around a conductor instead of breaking the circuit, which is why this tool appeals to electricians, technicians and careful DIY users. Three clamp meters in this list fit the keyword. This guide compares them by current…
As an Amazon Associate we earn from qualifying purchases. Details An analog insulation tester is a megohmmeter with a pointer or analog-style scale, used to read insulation resistance. This guide compares four boards from their listings. Two listings name an analog display clearly, and two list both digital and analog features in the title. Insulation…
As an Amazon Associate we earn from qualifying purchases. Details An operational amplifier tester is a small test board for checking op amp chips before you reuse them. This guide compares five boards from their product listings. Each board covers a different mix of single, dual and quad chips, a different supply voltage and a…
As an Amazon Associate we earn from qualifying purchases. Details A pocket toner coaxial cable tester is a small tracer that helps you find one coax line among many. You clip a transmitter to the end of the cable and a tone detector follows the signal through walls, ceilings and floors. This guide compares three…
As an Amazon Associate we earn from qualifying purchases. Details A surface resistivity tester measures how easily a surface conducts or resists electrical charge, and the figures are given in ohms. This page compares five meters that came up for a surface resistivity search. One result, a home mold test kit, was not a resistivity…
As an Amazon Associate we earn from qualifying purchases. Details A 110v outlet tester is a small plug-in or handheld tool that checks whether a receptacle has power, whether its wiring is correct and whether its GFCI protection works. The listings in this group differ more than their titles suggest. Some are plug-in style checkers,…
As an Amazon Associate we earn from qualifying purchases. Details A 110 220 voltage tester tells you whether a household outlet, switch or cord carries AC voltage, and some models also give a reading in volts. Household mains circuits can kill, so the tester’s rating must suit the circuit you touch. The six options below…
As an Amazon Associate we earn from qualifying purchases. Details What is the best power probe fuse tester for vehicle work? A power probe fuse tester is a handheld circuit tester that checks voltage, continuity and fuses on 12V and similar DC systems. Most models are built for cars, trucks, motorcycles, boats and trailers. The…
As an Amazon Associate we earn from qualifying purchases. Details A wire insulation tester is a megohmmeter, an instrument that measures the resistance of insulation, which is a different question from whether a wire carries voltage. Only one listing in this guide is an insulation tester, so this roundup covers that one pick and explains…
As an Amazon Associate we earn from qualifying purchases. Details An outlet tester for a standard wall outlet checks wiring conditions such as an open ground, an open neutral or reversed polarity, and some models also check GFCI protection. A circuit breaker finder helps you match an outlet or light to its breaker. This guide…