1. Introducció
The Klein Tools CL800 is an automatically ranging True Root Mean Squared (TRMS) digital clamp meter designed for professional electricians and DIY enthusiasts. This versatile tool measures AC/DC voltage, resistance, continuity, frequency, capacitance, and tests diodes via test-leads. It also measures temperature via a thermocouple probe and features a Low Impedance (LoZ) mode for identifying and eliminating ghost or stray voltages. Built for durability, the CL800 is engineered to withstand demanding jobsite conditions.

Figure 1: Klein Tools CL800 Digital Clamp Meter highlighting its True RMS measurement technology, voltage, current, resistance, temperature ranges, 2m drop protection, IP40 ingress protection, and CAT III/CAT IV safety ratings.
2. Informació de seguretat
WARNING: Read, understand, and follow all instructions, cautions, and warnings attached to and/or packed with all test and measurement devices before each use.
- Do not attempt to measure resistance or continuity on live circuits.
- Abans de cada ús, verifiqueu el funcionament del comptador mesurant un volum coneguttage o actual.
- No utilitzeu el comptador durant tempestes elèctriques o en temps humit.
- No utilitzeu el mesurador ni els cables de prova si sembla que estan danyats.
3. Configuració
3.1. Instal·lació de la bateria
The CL800 requires 2 AAA batteries (included). To install or replace batteries:
- Ensure the meter is OFF.
- Localitzeu el compartiment de la bateria a la part posterior del mesurador.
- Utilitzeu un tornavís per obrir la tapa de la bateria.
- Insert the batteries, observing correct polarity (+/-).
- Col·loqueu la coberta i fixeu-la amb el cargol.
3.2. Connexió dels cables de prova
The meter comes with test leads. Connect them to the appropriate jacks:
- The black lead connects to the COM (Common) jack.
- The red lead connects to the VΩHz%Temp jack for most measurements (voltage, resistance, frequency, temperature, capacitance, diode).

Figura 2: superior view of the Klein Tools CL800, illustrating the input jacks for connecting test leads. The black COM jack and the red VΩHz%Temp jack are clearly visible.
4. Instruccions de funcionament
The CL800 features a rotary dial to select measurement functions and buttons for additional settings. The backlit LCD display provides clear readings.

Figura 3: Frontal view of the Klein Tools CL800, displaying the LCD screen, rotary function dial, and control buttons for various measurement modes.
4.1. AC/DC Voltage Mesura
- Gireu el dial giratori cap a V~ (Volum AC)tage) o V- (DC Voltage) position. Use the SEL button to toggle between AC and DC if needed.
- Connect the test leads to the circuit points you wish to measure.
- Llegeix el voltage valor a la pantalla.

Figure 4: An electrician uses the Klein Tools CL800 to safely measure voltage across terminals in a circuit breaker panel, demonstrating practical application.
4.2. Mesura de corrent AC/DC (Clamp)
- Gireu el dial giratori cap a A~ (corrent altern) o A- (DC Current) position. Use the SEL button to toggle between AC and DC if needed.
- Premeu el clamp gallet per obrir les mandíbules.
- Enclose a single conductor (not a bundle of wires) within the clamp mandíbules.
- Llegiu el valor actual a la pantalla.

Figure 5: An electrician utilizes the clamp function of the Klein Tools CL800 to measure current on a wire, with the backlit display providing visibility in dim conditions.
4.3. Resistance, Continuity, Diode, Capacitance, Frequency, Temperature
Select the corresponding function on the rotary dial. For resistance (Ω), continuity ()))), díode (->|), and capacitance (--| |--), connect the test leads to the component. For frequency (Hz%) and temperature (°F/°C), connect the leads or thermocouple probe as appropriate.

Figure 6: The Klein Tools CL800 is shown measuring temperature using its thermocouple probe, demonstrating its multi-functionality beyond electrical parameters.
4.4. Low Impedance (LoZ) Mode
The LoZ mode helps identify and eliminate ghost or stray voltages. Select the LoZ function on the dial and connect the test leads to the circuit. This mode provides a more accurate reading by presenting a low impedance to the circuit, which drains away ghost voltages.
4.5. Vol sense contactetage Tester (NCVT)
To use the NCVT feature, press the NCV button. Hold the tip of the meter near a voltagfont electrònica. El mesurador indicarà la presència de voltatge de CAtage with visual and/or audible alerts.
4.6. Backlit Display and Worklight
The CL800 features a backlit display for improved visibility in low-light conditions. It also includes an integrated worklight to illuminate the work area. Refer to the full user manual for specific button presses to activate these features.
5. Manteniment
5.1. Neteja
Wipe the meter with a dry, lint-free cloth. Do not use abrasive cleaners or solvents. Ensure the meter is off and disconnected from any circuits before cleaning.
5.2. Substitució de la bateria
Replace batteries when the low battery indicator appears on the display to ensure accurate readings and proper operation. Follow the steps in Section 3.1.
5.3. Emmagatzematge
When not in use, store the meter and its accessories in the included carrying case in a cool, dry place away from direct sunlight and extreme temperatures.
6. Solució De Problemes
- El comptador no s'encén: Comproveu la instal·lació de les piles i assegureu-vos que no estiguin esgotades. Substituïu-les si cal.
- Lectures inexactes: Verify correct function selection on the rotary dial and proper test lead connection. Ensure batteries are not low. For DC current, remember to zero out the display using the ZERO button before measurement.
- Display shows "OL" (Overload): The measured value exceeds the meter's range for the selected function. Select a higher range if available, or ensure the measurement is within the meter's capabilities.
- Display is jumping or unstable: This can occur with AC voltage due to floating voltages. Use the LoZ mode for more stable readings in such situations.
- Negative symbol on DC voltage / actual: Indicates reversed polarity of the test leads. The magnitude of the reading is still correct.
7. Especificacions
| Característica | Especificació |
|---|---|
| Fabricant | Eines Klein |
| Número de part | CL800 |
| Pes de l'article | 12.5 unces |
| Dimensions del producte | 9.09 x 3.82 x 1.54 polzades |
| Número de model de l'article | CL800 |
| Bateries | Necessites 2 piles AAA (incloses) |
| Estil de visualització | 6000 Count LCD |
| Precisió de la mesura | Voltage Tester |
| Característiques especials | Low Battery Indicator, Auto Shut Off |
| Components inclosos | Carrying Case, 41'' (1041.4 mm) Test Leads, Thermocouple with Adapter, and Batteries |
| Certificació | Meets relevant industry standards (CAT III 1000V, CAT IV 600V) |
| Protecció d'entrada | IP40 |
| Protecció contra caigudes | 6.6 peus (2 m) |
8. Garantia i Suport
The Klein Tools CL800 Digital Clamp Meter comes with a 1-year manufacturer's warranty. For technical support, service, or warranty claims, please refer to the contact information provided in the original product packaging or visit the official Klein Tools weblloc.





