Klein Tools is one of the most trusted names in electrical test equipment, and their clamp meter lineup is no exception. The Klein CL390 and Klein CL700 are two popular models that share many similarities but cater to different types of professionals. If you’re trying to decide which one best suits your needs, this in-depth comparison will help you make the right choice.
🔍 Overview
The Klein CL390 is a mid-range AC/DC clamp meter designed for technicians who need reliable measurements at an affordable price. It includes True RMS accuracy, temperature measurement, and a reverse-contrast display for improved visibility.
The Klein CL700 is a higher-end, industrial-grade clamp meter with a broader range of measurement capabilities, higher voltage capacity, and better safety ratings. It’s built for electricians and engineers who deal with demanding electrical environments or require CAT IV-rated protection.
📊 Specification Comparison
| Feature | Klein CL390 | Klein CL700 |
|---|---|---|
| True RMS | Yes | Yes |
| AC Current | 400A | 600A |
| DC Current | 400A | 600A |
| AC/DC Voltage | 600V | 1000V |
| Resistance | 40 MΩ | 60 MΩ |
| Capacitance | 4000 µF | 6000 µF |
| Frequency | 1 MHz | 1 MHz |
| Temperature Measurement | –40°F to 1832°F | –40°F to 1832°F |
| Non-Contact Voltage (NCV) | Yes | Yes |
| Display Count | 4000 (reverse contrast) | 6000 (backlit LCD) |
| Safety Rating | CAT III 600V | CAT IV 600V / CAT III 1000V |
| Drop Protection | 2 meters | 2 meters |
| Jaw Opening | 1.6 in (41 mm) | 1.4 in (36 mm) |
| Backlight | Yes | Yes |
| Data Hold / Min/Max | Yes | Yes |
| Weight | 11 oz | 13 oz |
⚙️ Performance and Accuracy
The CL390 delivers excellent performance for its price, offering all the essential functions needed for day-to-day electrical and maintenance tasks. It’s accurate, quick to respond, and ideal for technicians working in residential or light commercial settings. The True RMS capability ensures precise readings even on complex waveforms, such as those from variable frequency drives or modern appliances.
The CL700 takes performance up a notch. It’s designed for professionals dealing with higher current and voltage levels, such as industrial electricians or field engineers. With a 1000V rating, it can handle larger systems safely. Its 600A current capacity and higher resistance range make it suitable for diagnosing high-load circuits, motors, and power distribution systems.
🧰 Build and Design
Both models share Klein’s hallmark durability with rugged housings and 2-meter drop protection. They feature ergonomic grips, well-balanced weight distribution, and clear rotary selectors that make them easy to operate with one hand.
The CL390 includes a reverse-contrast LCD screen, providing excellent readability in bright sunlight or dim environments. The CL700 uses a higher-resolution 6000-count display that offers finer detail, which can be beneficial when dealing with low-current readings or precise voltage checks.
🌡 HVAC and Temperature Applications
Both clamp meters include temperature measurement with the included thermocouple probe. The CL390 works perfectly for HVAC technicians, measuring both AC/DC current and temperature without requiring an additional multimeter.
The CL700 extends the same functionality but provides better protection and accuracy, making it a strong choice for those who need temperature readings alongside high-voltage or industrial power system checks.
⚡ Safety Ratings
Safety is where the CL700 truly stands out. Its CAT IV 600V / CAT III 1000V rating provides superior protection when working near service entrances or outdoor panels where transient voltage spikes can occur. The CL390, rated at CAT III 600V, is perfectly adequate for household and standard commercial systems but not ideal for industrial environments with higher surge potential.
💡 Ease of Use
Both meters are intuitive to use, with auto-ranging, data hold, Max/Min recording, and auto power-off features. The CL390 wins slightly in portability and simplicity, while the CL700 offers a more premium feel and higher precision for demanding users.
🧩 Ideal Use Cases
| User Type | Recommended Model | Reason |
|---|---|---|
| Residential Electricians | CL390 | Perfect balance of features and affordability |
| HVAC Technicians | CL390 | Measures temperature and current efficiently |
| Industrial Electricians | CL700 | Handles higher voltage/current safely |
| Solar & Battery Technicians | CL700 | Works with high-voltage DC systems |
| General Maintenance | CL390 | Simple, rugged, and reliable everyday tool |
🏁 Verdict
Both the Klein CL390 and CL700 are excellent clamp meters, but they serve different professionals.
Choose the Klein CL390 if you need a dependable, affordable AC/DC clamp meter for residential, HVAC, or light commercial use. It’s compact, easy to use, and provides all essential measurements with True RMS precision.
Choose the Klein CL700 if you regularly work with high-voltage or industrial systems. Its higher current range, better safety rating, and enhanced display make it a top-tier choice for professional electricians and engineers who need durability and performance in the toughest environments.
In short, the CL390 is the smart choice for everyday technicians, while the CL700 is the professional powerhouse built for demanding electrical work.