testo 770-2 – TRMS Clamp Meter
- Accurate, non-contact current measurement in the tightest switch cabinets
Work faster, safer and with complete confidence using the testo 770-2. Designed for professional electricians, HVAC engineers and industrial maintenance teams, this advanced TRMS clamp meter delivers reliable non-contact current measurement even in densely packed electrical panels. With its innovative retractable pincer arm, automatic AC/DC detection and extended measurement functions, the testo 770-2 Clamp Meter is the smart choice for demanding day-to-day electrical testing.
👉 Request a quote or speak to a specialist today to see how the testo 770-2 can improve your testing workflow.
Why choose the testo 770-2 Clamp Meter?
The testo 770-2 Clamp is purpose-built for modern electrical environments where space is limited and accuracy is critical. Its unique grab mechanism allows one pincer arm to retract fully into the instrument, making it easy to clamp onto individual conductors in crowded switch cabinets without contact or disruption.
Featuring True RMS (TRMS) measurement technology, the testo 770-2 delivers accurate readings on distorted signals and non-linear loads. Automatic measurement parameter detection further reduces setup time and eliminates user error by selecting the correct function for AC/DC voltage, current, resistance, continuity, diode and capacitance measurements.
Building on the standard functionality of the 770-1, the testo 770-2 Clamp Meter adds a µA current range and temperature measurement capability via a Type K thermocouple adapter, making it a versatile, professional-grade instrument.
testo 770-2 Key Features:
Fully retractable pincer arm
- One clamp jaw retracts completely into the housing
- Ideal for tightly packed cables and confined switch cabinets
- Enables fast, non-contact current measurement
True RMS measurement (TRMS)
- Accurate readings on complex and non-linear electrical loads
- Suitable for modern installations and variable frequency drives
Automatic AC/DC detection
- The testo 770-2 automatically recognises AC or DC voltage and current
- Intelligent parameter selection for resistance, continuity, diode and capacitance
Extended measurement functionality
- µA current measurement for sensitive applications
- Integrated temperature adapter for Type K thermocouples
- Inrush (starting) current measurement for electric motors
Designed for daily professional use
- Large, clear two-line LCD display with backlight
- Ergonomic housing and intuitive rotary switch
- Robust construction for on-site reliability
▶ See What the Testo 770 Can Really Do:
Typical Applications
The testo 770-2 Clamp Meter is ideally suited for:
- Current consumption measurement in switching cabinets
- Testing voltage supply on live conductors
- Measuring ionisation current in heating systems
- Continuity testing on electrical components
- Resistance measurement on sensors and motor windings
- Capacitance testing
- Quick and reliable temperature checks using Type K probes
Technical Specifications – testo 770-2 Clamp Meter
| Features | |
| Temperature (TC Type K – NiCr-Ni) |
| Measuring range | -20 to +500 °C |
| Accuracy | ±1 °C (0 to +100 °C) |
| Resolution | 0.2 °C |
| DC Voltage |
| Measuring range | 1 mV to 600 V |
| Resolution | max. 1 mV |
| Accuracy | ± (0.8 % of mv + 3 digits) |
| AC Voltage |
| Measuring range | 1 mV to 600 V |
| Resolution | max. 1 mV |
| Accuracy | ± (1.0 % of mv + 3 digits) |
| DC Current |
| Measuring range (clamp) | 0.1 to 400.0 A |
| Measuring range (measuring cables) | 0.1 to 400.0 µA |
| Resolution (clamp) | 0.1 A |
| Resolution (measuring cables) | 0.1 µA |
| Accuracy (measuring cables) | ± (1.5 % of mv + 5 digits) |
| Accuracy (clamp) | ± (2.0 % of mv + 5 digits) |
| AC Current |
| Measuring range (clamp) | 0.1 to 400.0 A |
| Measuring range (measuring cables) | 0.1 to 400 µA |
| Resolution (clamp) | 0.1 A |
| Resolution (measuring cables) | 0.1 µA |
| Accuracy (measuring cables) | ± (1.5 % of mv + 5 digits) |
| Accuracy (clamp) | ± (2.0 % of mv + 5 digits) |
| Resistance |
| Measuring range | 0.1 Ω to 40.00 MΩ |
| Resolution | max. 0.1 Ω |
| Accuracy | ± (1.5 % of mv + 3 digits) |
| Capacitance |
| Measuring range | 0.01 nF to 100.0 µF |
| Resolution | max. 0.01 nF |
| Accuracy | max. ± (1.5 % of mv + 5 digits) |
| Instrument Measurement Functions |
| True RMS (TRMS) | ✓ |
| Inrush current measurement | ✓ |
| µA current measuring range | ✓ |
| Automatic measurement parameter detection | ✓ |
| Continuity testing | ✓ |
| Diode test | ✓ |
| Min / Max | ✓ |
| Hold function | ✓ |
| Display backlight | ✓ |
| Display resolution | 4,000 counts |
| General Technical Data |
| Operating temperature | -10 to +50 °C |
| Storage temperature | -15 to +60 °C |
| Operating humidity | 0 to 80 %RH |
| Dimensions | 249 × 96 × 44 mm |
| Weight | 378 g |
| Display | 2-line LCD |
| Battery type | 3 × AAA micro batteries |
| Interface | 2 measuring jacks |
| Internal resistance | 11 MΩ (AC / DC) |
| Overvoltage category | CAT IV 600 V |
| Standards | EN 61326-1; EN 61010-2-032; EN 61140 |
| Authorisations | CSA; CE |
| Product colour | Black |
| Connectable probes | 1 × temperature probe (adapter required for Type K thermocouples) |
What comes with the testo 770-2?
- testo 770-2 Clamp Meter
- Batteries
- 1 set of measuring cables
- Integrated temperature adapter for Type K thermocouples
❓ Frequently Asked Questions (FAQ)
Q1: What is the difference between the testo 770-2 and 770-1?
A. The testo 770-2 includes a µA current measurement range and temperature measurement capability via a Type K thermocouple adapter, in addition to all standard TRMS and inrush current functions found on the 770-1.
Q2: Can the testo 770-2 be used in live switch cabinets?
A. Yes. The testo 770-2 Clamp Meter is designed specifically for use in confined switching cabinets and supports safe non-contact measurements on live conductors.
Q3: Does the testo 770-2 automatically detect AC and DC?
A. Yes. The instrument automatically detects AC/DC voltage and current, reducing setup time and minimising the risk of incorrect settings.
Q4: Who is the testo 770-2 best suited for?
A. The testo 770-2 Clamp is ideal for electricians, HVAC engineers, service technicians and industrial maintenance professionals who require accurate, reliable measurements in tight working environments.