How high of voltage will it test ?

The included paperwork says 600 Volt. That’s kind of an industrywide cut off point between “normal“ power versus what is generally considered to be high voltage. I would feel comfortable using it to test 480 V all day long. I would not use it over 600 V under any circumstances.

Does it measure volts in millivolts in DC? How many digits does it show after the decimal?

Yes. 3 decimal points after whole volts. I.e.; 1.419 volts for a AA battery

Is a case furnished with the meter?

My CL-120 cane with a fabric zip case

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Description

⚡ Clamp, Test, Conquer – The Pro’s Choice for Effortless Electrical Mastery

BUILT TO LAST - Durable design with double insulation and CE certification for professional reliability
TOUCH FREE SAFETY - Integrated non-contact voltage tester ensures safe, no-touch voltage detection
HANDS FREE EFFICIENCY - Optional magnetic hanger and built-in test lead holder keep your hands free
PRECISION MEETS POWER - Auto-ranging up to 400 Amps AC/DC for versatile electrical diagnostics
WORK ANYWHERE ANYTIME - Backlit LCD screen for clear readings in dim or confined spaces

The Klein Tools CL120 Digital Clamp Meter combines a 400 Amp auto-ranging AC/DC clamp with a non-contact voltage tester, backlit LCD, and hands-free features like a magnetic hanger and test lead holder. Designed for professionals, it offers durable, safe, and precise electrical measurements in any environment.

Specifications

Manufacturer	Klein Tools
Part number	CL120
Item Weight	277 g
Product Dimensions	21.46 x 8.92 x 3.84 cm; 276.69 g
Item model number	CL120
Size	1.6'' (4.1 cm)
Color	green
Style	Clamp Meter
Finish	Brushed
Material	Blend
Pattern	Clamp Meter
Shape	Rectangular
Power source type	Corded Electric
Item Package Quantity	1
Specification met	Double Insulation Safety Rating, Ce Certified
Special Features	Automatic Ranging for Measurement; NCVT
Included components	Digital Clamp Meter, AC Auto-Ranging 400 Amp
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

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