Klein Tools CL390 is an automatically ranging true root mean squared (TRMS) digital clamp meter. It measures AC/DC current and NCVT via the clamp, AC/DC voltage, DC microamps, resistance, continuity, frequency, capacitance, and diodes via test leads, and temperature via a thermocouple probe. It features a high visibility, reverse contrast LCD display that optimizes view ability both in dark or bright ambient lighting.Features Includes a carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instructions, and 3 x AAA batteries Max/Min, Rel/Zero and Data Hold capability Measures AC/DC current and NCVT via clamp and AC/DC voltage, resistance, frequency, DC microamps, capacitance, duty cycle, diode test, and continuity via test-leads, and temperature with thermocouple Automatically ranging True Root Mean Squared (TRMS) measurement technology for accuracy Non-contact voltage tester integrated into the clamp jaw High-visibility reverse contrast LCD display for improved view ability in all ambient lighting conditions Measures temperature with a K-Type thermocouple probe Built to withstand a 6.6-Foot (2 m) drop Auto-power off after 10 minutes to conserve battery life Low battery indicator and easily accessible battery compartment Meets requirements for use in basic and controlled electromagnetic environments like residential, office and light-industrial locations CAT III 600V, Class 2, Double insulation safety rating Test lead holder on side of clamp and optional magnetic hanger for meter (Cat. Nos. 69445 or 69417) for hands free operation Automatically Ranging True Root Mean Squared (TRMS) Measurement Technology for Accuracy; AC/DC Current Measurement; High Visibility Reverse Contrast LCD; NCVT Warnings Read, understand and follow all instructions, cautions and warnings attached to and /or packed with all test and measurement devices before each use. Usage of this meter in any way other than that specified by the manufacturer can impair safe operation, resulting in severe injury or death. Do not attempt to measure resistance or continuity on live circuits. Do not use the meter during electrical storms or in wet weather, and do not use the meter or test leads if they appear to be damaged. Before each use verify meter operation by measuring a known voltage or current. Amperage: 400 A AC/DC Voltage: 600 V AC/DC Frequency Range: 10 Hz to 60 kHz Capacitance: 4000 b5F Resistance: 40 Ma9 Temperature Range: -40b0 to 1832b0F (-40b0 to 1000b0C) Measurement Technology: True RMS Auto-Ranging Jaw Size: 1.6 in (4.1 cm) Overall Length: 8.45 in (21.5 cm) Overall Width: 3.5 in (8.9 cm) Overall Height: 1.5 in (3.8 cm) Weight: 0.516 lbs Material: ABS/Electronics Safety Rating: CAT III 600 V, Class 2 Double Insulation, CE Certified Display: 4000 Count Reverse Contrast LCD (1.57 x 0.87 in) DC Polarity Indicator: Yes DC Micro-Amp: 200 b5A Non-Contact Voltage Tester: Integrated NCVT Clamp Jaw Battery Type: 3 x AAA Auto Power Off: Yes, after 10 minutes DownloadsSafety Data SheetVideo DownloadBrochure 1Spec SheetInstructionsCL390-1390366ART - WEBV2.pdfCL390EU_Instructions.pdf