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. Jaw Size 1.6" (4.1 cm) DC Polarity Indicator YesDisplay 4000 Count Reverse Contrast LCD Voltage 600 V AC/DC Overall Length 8.45" (21.5 cm) DC Micro-Amp 200 µA DC Voltage 600 V Current 400 A AC/DC Drop Protection 6.6' (2 m) Capacitance 4000 µF Batteries 3 x AAA Application Measures both AC/DC current and NCVT via the clamp and AC/DC voltage, DC microamp current, resistance, continuity, frequency, duty-cycle, capacitance and tests diodes via the test leads, and temperature with thermocouple Overall Width 3.5" (8.9 cm) Standard CATIII 600V, Class 2, Double Insulation Safety Rating, CE Certified Functions TRMS, AC/DC Current, NCVT, AC/DC Voltage, Resistance, DC microamp, Frequency, Capacitance, Continuity, Duty Cycle, Diode Test, and Temperature Material ABS/Electronics Frequency 10 Hz to 60 kHz for 8 V to 220 V AC RMS Special Features Automatically Ranging True Root Mean Squared (TRMS) Measurement Technology for Accuracy; AC/DC Current Measurement; High Visibility Reverse Contrast LCD; NCVT Weight 11 oz (314 g) AC Voltage 600 V Temperature Range -40° - 1832°F (-40° - 1000°C) Included Carrying Case, Instructions, Test Leads, Thermocouple, and Batteries Overall Height 1.5" (3.8 cm) Type AC/DC Current TRMS Clamp Ingress Protection —