Best Digital Multimeter Under £100
Finding a reliable digital multimeter that balances accuracy, safety, and features without breaking the bank is essential for any electrician or serious DIYer. We have compared the top models under £100 to help you choose the right tool for your needs.
Quick answer
The Fluke 17B+ is the best overall digital multimeter under £100 for its unmatched accuracy, robust build, and CAT III safety rating. For a budget-friendly alternative that still delivers excellent performance, the AstroAI DM6000AR offers true RMS and a wide range of features at a fraction of the cost.
Why trust ToolBuyerHub
- Tested on specs (accuracy, safety ratings, ranges)
- Battery & ecosystem compared
- Aggregated owner reviews from major retailers
- Build quality & warranty checked
- Brand reliability (Fluke, AstroAI, Klein, Uni-T, Sealey)
- No fake hands-on claims
Research updated June 2026.
Fluke 17B+ Digital Multimeter
Industry-standard accuracy and safety in a budget-friendly package.
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Fluke 17B+ | Best Overall | True RMS, CAT III 600V | 4.8/5 | Check Amazon |
| AstroAI DM6000AR | Best Budget | True RMS, 6000 Counts | 4.6/5 | Check Amazon |
| Klein Tools MM400 | Best for Electricians | Auto-Ranging, CAT III 600V | 4.7/5 | Check Amazon |
| Uni-T UT61E | Best for Precision | 22000 Counts, 0.1% Accuracy | 4.5/5 | Check Amazon |
| Sealey MM12 | Best Value | Auto-Ranging, NCV | 4.4/5 | Check Amazon |
Fluke 17B+ Digital Multimeter
Best OverallPros
- Excellent build quality and durability
- True RMS for accurate AC readings
- CAT III 600V safety rating
Cons
- No backlight on display
- Limited to 4000 counts
The Fluke 17B+ is the gold standard for budget multimeters. It offers the reliability and accuracy that professionals expect from the Fluke brand, with a 0.5% DC accuracy and true RMS capability for measuring non-linear signals. The CAT III 600V safety rating provides peace of mind when working on industrial circuits.
Owner reviews consistently praise its robust construction and clear display. While it lacks a backlight and has a lower count than some competitors, its safety and precision make it the top choice for serious users who need a dependable tool for everyday electrical work.
AstroAI DM6000AR Digital Multimeter
Best BudgetPros
- Excellent value for money
- True RMS and 6000 counts
- Includes NCV and temperature functions
Cons
- Build quality not as rugged as Fluke
- Auto-ranging can be slow sometimes
The AstroAI DM6000AR is the best budget digital multimeter under £100. It offers true RMS measurement, a 6000-count display, and non-contact voltage (NCV) detection, making it a versatile tool for home electrical work, automotive diagnostics, and electronics projects. The included thermocouple adds temperature measurement capability.
Owner reviews highlight its accuracy and feature set for the price. While the build quality is not as robust as professional-grade meters, it is more than adequate for DIYers and hobbyists. The auto-ranging function is generally reliable, though some users note it can be slightly slow when switching between ranges.
Klein Tools MM400 Digital Multimeter
Best for ElectriciansPros
- Rugged, over-molded housing
- Auto-ranging with manual option
- Integrated test lead holder
Cons
- No true RMS
- No temperature measurement
The Klein Tools MM400 is designed with electricians in mind. Its rugged over-molded housing protects against drops, and the integrated test lead holder keeps the probes organized. The auto-ranging function is fast and reliable, and the manual mode allows for precise range selection. It is CAT III 600V rated for safety.
Owner reviews frequently mention its durable build and clear display. The lack of true RMS is a limitation for measuring non-sinusoidal waveforms, but for standard residential and commercial electrical work, the MM400 is a dependable and tough tool that can withstand daily job site use.
Uni-T UT61E Digital Multimeter
Best for PrecisionPros
- Exceptional 0.1% DC accuracy
- 22000 count high-resolution display
- True RMS for precision AC measurements
Cons
- CAT II rating limits high-energy use
- No auto-ranging
The Uni-T UT61E is a precision instrument for electronics work. With a 0.1% DC accuracy and a 22000-count display, it offers resolution and accuracy that rivals much more expensive meters. The true RMS capability ensures accurate readings on complex waveforms, making it ideal for audio, power supply, and circuit design.
Owner reviews praise its accuracy and large display. However, its CAT II 1000V rating means it is not suitable for high-energy industrial circuits. The manual ranging can be a drawback for quick checks, but for bench work and detailed diagnostics, the UT61E is an outstanding tool under £100.
Sealey MM12 Digital Multimeter
Best ValuePros
- Very affordable price
- Auto-ranging and NCV detection
- CAT III safety rating
Cons
- No true RMS
- Basic build quality
The Sealey MM12 is a great value option for DIYers who need a reliable multimeter for basic tasks. It features auto-ranging, non-contact voltage detection, and a CAT III 600V safety rating, making it suitable for home electrical work. The large LCD display is easy to read, and the unit is compact for storage.
Owner reviews appreciate its low cost and ease of use. While it lacks true RMS and has a simpler build compared to professional models, it performs well for checking voltage, continuity, and resistance in household circuits. It is a solid choice for beginners or as a backup meter.
What to check before buying a digital multimeter under £100
When choosing a digital multimeter, focus on the safety rating. Look for at least CAT III 600V for residential and light commercial work. True RMS is important if you will measure non-sinusoidal waveforms, common in modern electronics. The display count determines resolution; 4000 counts is standard, but 6000 or more offers better precision. Consider auto-ranging for convenience, but manual ranging can be more accurate for specific tasks. Finally, check for features like NCV, temperature measurement, and a backlight based on your typical use.
Mistakes to avoid when buying a multimeter
A common mistake is ignoring the safety rating. A meter without a proper CAT rating can be dangerous on high-energy circuits. Another error is buying a meter without true RMS if you work with variable frequency drives or switching power supplies. Do not overlook the build quality; a fragile meter may not survive a drop on a job site. Also, avoid meters with too many features if you only need basic voltage and resistance checks, as they can be more complex to use. Finally, always check that the test leads are of good quality and have the correct safety rating.
FAQs
What does CAT III 600V mean on a multimeter?
CAT III 600V means the meter is designed for safe use on fixed installation circuits, like distribution boards and industrial equipment, up to 600 volts. It offers a higher level of protection against transient surges than CAT II meters.
Do I need a true RMS multimeter?
Yes, if you measure AC signals from devices like variable frequency drives, LED drivers, or switching power supplies. True RMS provides accurate readings on non-sinusoidal waveforms, while average-responding meters can be inaccurate.
What is the difference between auto-ranging and manual ranging?
Auto-ranging automatically selects the correct measurement range, making it faster and easier for general use. Manual ranging requires you to select the range, which can be more precise for specific measurements and avoids slow auto-ranging.
Can I use a multimeter to test car batteries?
Yes, a digital multimeter can measure DC voltage to check a car battery's state of charge. A fully charged battery should read around 12.6 volts. For load testing, a dedicated battery tester is recommended.
What is the best digital multimeter for a beginner?
The AstroAI DM6000AR is a great choice for beginners due to its low price, auto-ranging, and included features like NCV and temperature measurement. It is easy to use and offers good accuracy for home projects.
How accurate is a cheap digital multimeter?
Budget multimeters typically have a DC accuracy of 0.8% to 1.5%, which is sufficient for most DIY tasks. For professional work requiring high precision, look for meters with 0.5% accuracy or better, like the Fluke 17B+.
What does the display count mean on a multimeter?
The display count indicates the maximum number the meter can show on its display. A 4000-count meter can display up to 3999, while a 6000-count meter can show up to 5999, offering better resolution for small measurements.
Is it safe to use a multimeter on mains voltage?
Yes, as long as the multimeter has a CAT II or CAT III rating suitable for the voltage you are measuring. Always use the correct input jacks and test leads rated for the voltage. Never use a meter with damaged leads.
What is non-contact voltage (NCV) detection?
NCV detection allows the multimeter to sense the presence of AC voltage without touching the conductor. It is a useful safety feature for identifying live wires before making contact, but it should not replace proper testing.
How do I maintain my digital multimeter?
Keep the meter clean and dry, store it in a protective case, and replace the battery when the low battery indicator appears. Check the test leads for damage before each use, and calibrate the meter annually if used for precision work.
Our verdict
For the best overall digital multimeter under £100, the Fluke 17B+ is our top pick due to its superior accuracy, safety, and build quality. If you are on a tight budget, the AstroAI DM6000AR offers excellent value with true RMS and a wide feature set. For electricians needing a rugged daily driver, the Klein Tools MM400 is a tough and reliable choice.