What size battery does it take?

Hi, the battery model is CR2032，3v

How do you switch between inside and outside radius on this thing? Pressing the "Mode" button just switches radius to angle, not radius to radius.

Yes, the MODE is the switch between radius and angle, the switch between inside and outside radius is automatic conversion, when the display shown R1 is inside radius is ,R2 is outside radius

Does it come with any certificate of accuracy or traceability to nist or other nationally recognized metrological institutes such as asme, astm, etc.?

Hi friend: Sorry for it does not.

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CGOLDENWALL High accuracy digital radius gauge Electronic Inside and Outside Radius Gage with 10mm /20mm /30mm /60mm/100mm changeable measuring jaw Black 0.2" - 27.5"/5 mm - 700 mm

Product ID: 26399665

💻Data port for seamless PC connectivity

📏0.005mm ultra-fine resolution

🔄5 interchangeable jaws for versatile radius range

R5406

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure Like a Pro, Lead Like a Boss

COMPACT POWERHOUSE - Handheld, lightweight design with easy inch/mm toggle—your daily go-to for mechanical, mold, and construction precision.
INSTANT CLARITY DISPLAY - Large HD screen shows all key metrics—radius, arc height, metric/imperial units—at a glance.
VERSATILE RADIUS MASTERY - Switch effortlessly between 5 jaw sizes covering 5mm to 700mm radius ranges—adapt to any project.
SEAMLESS DATA INTEGRATION - Connect directly to your computer for quick data export and streamlined workflow.
PRECISION AT YOUR FINGERTIPS - Experience razor-sharp 0.005mm resolution for flawless inner & outer radius measurements.

The CGOLDENWALL High Accuracy Digital Radius Gauge is a professional-grade tool designed for precise measurement of inner and outer radii from 5mm to 700mm. Featuring a 0.005mm resolution, a large HD display, and 5 interchangeable jaws, it supports both metric and imperial units. Its data port enables direct computer connectivity for efficient data management. Ideal for engineers, mold makers, and construction professionals seeking reliable, versatile, and easy-to-use radius measurement.

Specifications

ASIN	B0127I4KHQ
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#214,526 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #23 in Radius Gauges
Color	Black
Customer Reviews	3.9 3.9 out of 5 stars (22)
Date First Available	July 21, 2015
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1.63 pounds
Manufacturer	CGOLDENWALL
Material	Metal
Package Dimensions	11.81 x 8.03 x 2.91 inches
Part Number	FF89

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R5406

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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