What type batteries and fuses does it take

It uses 2 x AAA batteries. Replace blown fuse with 200mA/600V fast-blow (Klein Cat No. 69031) The 10A jack requires 10A/600V fast-blow (Klein Cat. No. 69032)

Does it beep when using to check for continuity?

It has a setting for tone if checking continuity. It won’t beep when set on ohms.

I want to test household batteries. Is this unit able to put a load on the battery dyring testing?

No, i dont think thats a standard multimeter function. You can, however, do a load test using this meter and a power resistor. You put this meter in dc volt mode, connect it across the terminals of the battery, then connect a load resistor in parallel (also across terminals of battery). Compare the open circuit voltage to the voltage under load. The voltage drop should be specified for battery type. You should be able to calculate the appropriate resistor value using specs for the battery type as well.

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Klein Tools MM300 Multimeter, Digital Manual-Ranging Voltmeter, Tests Batteries, AC/DC, Current, Resistance, Diodes, and Continuity, 600V

Klein Tools MM300 Multimeter, Digital Manual-Ranging Voltmeter, Tests Batteries, AC/DC, Current, Resistance, Diodes, and Continuity, 600V

Product ID: 23796663

Details

Brand
KLEIN TOOLS
Color
Orange
Item Weight
0.77 Pounds
Power Source
Hand Powered
Style
Multimeter

⚡600V AC/DC voltage max

🔋Battery & diode tester

🛡️CAT III 600V safety rating

Description

🛠️ Klein MM300: The rugged multimeter that means business—don’t get left in the dark!

READY OUT OF THE BOX - Includes test leads, batteries, and manual so you can start measuring immediately
SAFETY FIRST ALWAYS - CAT III 600V rating ensures compliance and peace of mind on every job
PRO LEVEL VOLTAGE RANGE - Measures up to 600V AC/DC for versatile electrical diagnostics
BUILT TOUGH FOR THE JOB SITE - Withstands 3.3-foot drops and daily wear—your rugged work companion
PRECISION BATTERY CONTINUITY TESTING - Accurately tests batteries, diodes, and continuity to keep projects on track

The Klein Tools MM300 is a manual-ranging digital multimeter designed for electricians and DIY pros alike. It measures AC/DC voltage up to 600V, DC current up to 10A, and resistance up to 2MΩ, while also testing batteries, diodes, and continuity. Built to endure 3.3-foot drops and daily job site abuse, it carries a CAT III 600V safety rating for reliable, safe use in residential, business, and light-industrial environments. Compact and ready to use with included leads and batteries, the MM300 combines professional-grade durability with accessible pricing, making it the go-to tool for emerging makers and seasoned pros who demand quality without compromise.

Specifications

ASIN	B018O18VUW
Best Sellers Rank	#344,136 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #531 in Multi Testers
Brand Name	KLEIN TOOLS
Color	Orange
Customer Reviews	4.7 4.7 out of 5 stars (1,616)
Global Trade Identification Number	00092644690198
Included Components	Test Leads, Batteries, and User Manual
Item Dimensions	8.9 x 4.8 x 1.7 inches
Item Type Name	Klein Tools Digital Multimeter, Manual-Ranging, 600V MM300
Item Weight	0.77 Pounds
Manufacturer	Klein - Geneva Supply
Measurement Type	Multimeter, Voltmeter
Model	MM300
Part Number	MM300
Power Source	Hand Powered
Style Name	Multimeter
UPC	092644690198 675904101919 696582472689
Unit Count	1.0 Count
Upper Temperature Rating	50 Degrees Celsius
Warranty Description	1 year manufacturer

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