Klein Tools - For Professionals Since 1857

400A AC Auto-Ranging Digital Clamp Meter


This product is no longer in production.

  • Features best-in-class high-visibility dual-line OLED display screen, which presents information in reverse contrast to standard meters
  • High-visibility in reduced ambient lighting, as well as bright outdoor environments, and at acute angles to display
  • Provides all common measurements such as AC current, AC/DC voltage, continuity, resistance, capacitance, frequency, diodes and temperature
  • True RMS measurement technology
  • Dual-mode display can present simultaneous measurements
  • Bar graph emulates performance of an analog meter for visualizing fast moving events
  • Rugged Klein 'tough meter' industrial design stands up to jobsite demands
  • Includes test leads, K-type thermocouple, 3xAAA batteries and a protective carrying case
  • CAT III 600V safety rating
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Klein Tools CL330 is an automatically ranging true root mean square (TRMS) digital clamp meter that measures AC current via the clamp, AC/DC voltage, resistance, continuity, frequency, capacitance, and tests diodes via test-leads, and temperature via a thermocouple probe. It features a super bright high visibility dual-line OLED display screen that optimizes viewability in dark or bright environments and when viewed at angles far away from normal to the display.

Automatically Ranging TRMS Clamp Meter
Voltage Tester
Special Features:
Best-in-Class High-Visibility Dual-Line OLED Display Screen
3 x AAA
Jaw Size:
1.12'' (28.6 mm)
Drop Protection:
3.3 ft (1 m)
Digital LED
AC current, AC/DC Voltage, Continuity, Resistance, Capacitance, Frequency, Diodes and Temperature
CATIII 600V, Class 2, Double insulation
Pouch, 41'' (1041.4 mm) Test Leads, Thermocouple, and Batteries
Overall Length:
8.70'' (221.1 mm)
Overall Height:
1.61'' (40.9 mm)
Overall Width:
3.02'' (76.6 mm)
0.90 lb (410.0 g)
Additional Information
  • 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.