A continuity tester is a measuring instrument used by electricians and DIYers in checking electrical circuits. These inexpensive battery-powered devices comprise a cord, a probe, and an alligator clip for hooking it to an electrical circuit. As the name suggests, they help you identify an opening in an electrical circuit.
Unlike other electrical measuring instruments, continuity testers are used on de-energized circuits. You should turn off any electrical circuit you want to test before connecting a continuity tester. Do not use them on electrical circuits with current flowing through them because of the dangers involved.
What if you want to buy a new continuity, and what factors do you look for? When searching for a continuity tester online, famous brands such as Extech, Fluke, and Klein pop up in the search results. But which is the best? The many options can make it challenging to pick the most appropriate for the intended use.
Fortunately, you have researched and tested the most commonly used by professionals and DIYers and compiled a list of the 6 best continuity testers. Read on for a full review of these products and an included buying guide.
Top 6 Best Continuity Testers in 2024
Electrical continuity testers are inexpensive instruments. But you should make the right buying decision to get the best value for your money. Here is a list of the best continuity testers to consider:
| Product | Overview | Primary Function | Indication Methods | Price |
|---|---|---|---|---|
| 1. Extech CT20 Remote and Local Continuity Tester [Best Overall] |  | Continuity tester | 85dB Beeper | |
| 2. Fluke T5-1000 Electrical Tester |  | Continuity tester Voltage and current meter | Screen display Audible alarm | |
| 3. Fluke T5600 Electrical Continuity Tester |  | Continuity tester Voltage and current meter | Screen display Audible beep | |
| 4. Klein Tools ET250 Voltage Meter |  | Continuity tester Digital multimeter | Screen display Audible beep | |
| 5. Sperry Instruments CT6101 Heavy Duty Continuity Tester |  | Continuity tester | 360-degree light | |
| 6. Gardner Bender GCT-3304 Continuity Tester |  | Continuity tester | 360-degree light |
1. Extech CT20 Remote and Local Continuity Tester [Best Overall]
Extech CT20 continuity tester tops the list of the best continuity testers for the right reasons. It is easy to use, reliable, and cost-effective. Despite having the best features, Extech CT20 remains affordable compared with competing models. You don’t have to rob your bank account to buy this continuity tester.
Extech CT20 features a flashing LED and a loud pulsating beeper that indicates circuit continuity. These features make it a versatile tester that can be used in noisy and dark industrial environments and in a quiet, well-lit laboratory.
You also don’t need a third hand to use the Extech CT20 continuity tester. It is light, compact, and has clips it uses to hang on the cable under test.
Extech CT20 is ideal for different applications. It is the go-to continuity tester for cable TV and audio system installers, electricians, alarm technicians, HVAC installers, etc.
Specifications:
- Beeper: 85dB
- Battery life: Approx. 12 months with normal use.
- Continuity confirmation: Equal to or less than 2.0 K Ohms
- Continuity drive current: Pulsed (2.0 Hz) 20 – 50mA at 10 Ohms and 2.0mA – 8.0mA at 1000 Ohms.
- Wire Verification Distance: 10,000 ft., 3,000 m (26 Gage min.)
Pros:
- Power-efficient
- Relatively affordable
- Easy to use
- Has two indication methods – light and alarm
- Versatile and reliable
Cons:
- One-year warranty seems limited
2. Fluke T5-1000 Electrical Tester More Than Just Continuity Tester
Fluke T5-1000 is more than a continuity tester. You can also use this tester to measure AC and DC voltages up to 1,000 volts and currents in energized electrical circuits. It also has an integrated protection circuit, which gives it longer operational hours. But what makes it stand out is its accuracy and reliability. The continuity tester is backed up with a 2-year limited warranty.
This continuity tester also boasts a rugged build. Its casing is strong enough to withstand a 10-feet fall, meaning it will serve you for many years.
Fluke T5-1000 Electrical Tester has other features that make it easy to use. It has detachable slim reach probe tips that allow you to test circuits in tight places and a test lead holder.
Specifications:
- Jaw opening: 12.9 mm (0.5 in)
- Max wire size: 1/0 THHN Cable
- Current range (AC rms): 0 to 100.0 A
- Accuracy AC current (50/60 Hz): 3% ± 3 counts
- Voltage range AC/DC: 0 to 1000 V
- Voltage accuracy: AC 1.5% ± 2 counts and DC 1% ± 1 count
- Resistance range: 0 to 1000 Ω
- Continuity beeper threshold: On at < 25 Ω, off at > 400 Ω
- Volts indicator LED threshold: Guaranteed on by 30 V AC
- Maximum voltage: 1000 V between any terminal and earth ground
Pros:
- Fast and accurate
- Versatile – voltage, current, and continuity tester
- Easy to use
- Durable and reliable
- Automatic voltage measurements
- 2-year warranty
Cons:
- Relatively expensive
3. Fluke T5600 Electrical Continuity Tester
Fluke T5600 is a multi-functional tester for testing currents, voltages, and continuity. This device has a protection circuit that allows it to stay connected to the line for longer. It also automatically selects AC and DC voltages, making it easy to check the current in any circuit without compromising it. That is the reason many electrical technicians use it for checking the motors, compressors, generators, and other sensitive circuits.
Like fluke T5-1000, Fluke T5600 is also built to last and survive a 10-feet fall. Its rugged structure makes it one of the most rugged continuity testers on the market today. It also comes with detachable probes to help it reach squeezed places.
Specifications:
- Max wire size: 1/0 THHN Cable
- Current range (AC rms): 0 to 100.0 A
- Accuracy AC current (50/60 Hz): 3% ± 3 counts
- Voltage range AC/DC: 0 to 600 V
- Voltage accuracy: AC 1.5% ± 2 counts and DC 1% ± 1 count
- Resistance range: 0 to 1000 Ω
- Continuity beeper threshold: On at < 25 Ω, off at > 400 Ω
- Volts indicator LED threshold: Guaranteed on by 30 V AC
Pros:
- Auto off mode to conserve battery life
- Accurate and reliable
- Versatile – voltmeter, current meter, and continuity tester.
- Durable
- Compact and lightweight
- 2-year warranty
Cons:
- Relatively expensive
4. Klein Tools ET250 Voltage Meter & Continuity Tester
Klein Tools ET250 is a digital voltmeter and continuity tester. You can use it to measure AC/DC voltages of up to 600V and continuity on a line. But it stands out among other testers for additional capabilities. This tester can test GFCI-protected circuits to verify their functionality.
Klein Tools ET250 Voltage Meter features an integrated flashlight for working in relatively dark areas. It is also easy to use and comes with standard replaceable multimeter test leads and test holders on the back.
Klein Tools ET250 Voltage Meter is ruggedly built to survive a fall of about 10 feet. It is also protected against dust and water for longer service life.
Specifications:
- AC Voltage: 600 V
- Standard: CAT IV 600V, CE
- Voltage range: 2 to 600V AC/DC
- Frequency range: 45 to 400 Hz
Pros:
- Backlit LCD display and integrated flashlight for use in any condition
- Tests GFCI protected circuits for functionality
- Built-in test lead holders
- Ruggedly built for durability
- Dust and water resistant
Cons:
- Test leads are a bit loosely attached
5. Sperry Instruments CT6101 Heavy Duty Continuity Tester
Sperry Instruments is a known brand for the reliability of its devices. We have picked the Sperry Instruments CT6101 for the same reasons. This is a compact and affordable continuity tester designed for small applications.
You can use the Sperry Instruments CT6101 to test fuses, open circuits, and do other jobs. However, it is not designed for long runs. Mostly, people who buy this device are DIYers or hobbyists.
Sperry Instruments CT6101 is shaped like a fat maker. It is made of a visible yellow plastic housing with side grips to make it easy to hold. It has an alligator clip for hooking it to the circuit or fuse to be tested. The other end is a long probe.
Sperry Instruments CT6101 features a 360-degree light indicator that turns on for a continuous Cotuit. It also has an audible sound in case you are working in the open sun.
Pros:
- Affordable
- Bright 360-degree visual indication
- Durable, heavy-duty design
- Long probe to access hard-to-reach spaces
- Limited lifetime warranty
Cons:
- Basic continuity tester
6. Gardner Bender GCT-3304 Continuity Tester
Gardner Bender GCT-3304 is another affordable continuity tester on this list. As the name suggests, this device tests electrical circuit continuity but also can test AC and DC voltages of about 80V AC/DC.
This continuity tester features a long, flexible test lead for accessing tight places and a bright 360-degree visual indicator. You can use it in any lighting condition and for different applications.
The most common ones include testing doorbells, alarm systems, low-voltage control panels, outdoor lighting, automotive electrical circuits, etc.
Gardner Bender GCT-3304 is compact and ruggedly built with dual-insulated durable ABS housing. It is designed to last you a lifetime and withstand occasional drops at the job site.
Pros:
- Affordable
- Compact and lightweight
- Easy to use
- Bright light continuity indicator
Cons:
- Only used in non-energized circuits
- Limited functions
What to Consider Buying A Continuity Tester
What factors do you consider when buying a continuity tester? This buying guide answers the question and provides additional information you should know to make an informed buying decision.
1. Output Interface
Continuity testers have different output interfaces. You can choose those with display screens if you are interested in result analysis. Mostly, continuity testers that double as voltmeters have an LCD screen. These also display battery power and other information.
2. Indication Method
This is the most important feature if you need a continuity tester. The one you should choose should have both light and alarm indicators. The sound is ideal in some conditions. But if you are in a noisy place, you need light indication. And since most measuring instruments are used in different environments, having both options give you an advantage. It also makes the device more versatile.
3. Form Factor
Continuity testers come in all shapes and sizes. The one you buy depends on what you intend to use it for. For example, pocket-size and battery-powered devices are ideal for field technicians. On the other hand, a free-standing continuity tester or benchtop units are suitable for laboratory use.
4. Additional Features and Functions
Some continuity testers do more than just test circuits. If you have the budget, go for a unit that can double as a voltmeter or current meter. Also, consider devices with protection circuits that can withstand voltage spikes in a line. These are more durable and reliable.
5. Build Quality
Any electrical measuring instrument the size of a continuity tester suffers occasional drops. When buying one, you should only consider a unit that can withstand at least a 10-feet fall. Fortunately, most continuity testers in the market meet this criterion.
6. Ease of Use
The best continuity tester to buy should be operated by one hand. This feature includes the form factor, design, and functionality. Compact and lightweight devices are easy to carry. Also, consider the indication method. It should be easy to read values displayed if it doubles as a multimeter.
7. Safety Standard
Using any continuity tester should not expose you to any threats. Check for products with standards for safety performance, such as IEC 61010 from the International Electromechanical Commission. Also, consider regional safety standards.
Conclusion
Continuity testers have many uses, and buying the right one can make your work easier. We presented the best devices to choose from, but the following are our recommendations:
Extech CT20 continuity tester is the best choice. It is power-efficient, affordable, versatile, reliable, and easy to use. Go for it if you want a device dedicated to only testing circuits. Extech CT20 also has two indication modes. It produces light and an audible beep if an electrical circuit is continuous.
The second on our list is Fluke T5-1000. This continuity testing equipment is for professionals because it does more than just test circuits. It doubles as a voltmeter for measuring DC and AC voltages. Lastly, it is durable, reliable, and easy to use but costs more.
Fluke T5600 is a multi-functional tester for currents, voltages, and continuity. It is another option if you can afford it for personal or professional use and has all the features and functions of the Fluke T5-1000 continuity tester.
Our recommendations may not be the best fit for your budget or purpose. In that case, use the buying guide provided to make an informed buying decision.