What is the measurement range? I need to know the very smallest inside diameter it can measure as well as the largest.

The smallest inside will depend how deep you go, but close to surface I would say 1mm or even less. It goes up to 150mm.

could I use this to measure nut size so as to get the right socket?

Yes, you can. Measure the diameter of the nut from one flat side to the opposite flat side. That will be the size of the nut.

what are the drops and diamond images on the ruler for?

The RedBlack-01 has drops on the ruler and the RedBlack-02 and RedBlack-03 versions have drops and diamonds on the ruler. I do not think they are for anything specific, other than decoration. The ruler is only necessary on dial calipers, because the dial only shows sub-inch measurements. On a dial caliper, you add the dial number to the inch number showing on the ruler to get the full measurement. On digital calipers, the full measurement is shown on the display. The ruler is left-over from the older dial calipers most likely for tradition. Therefore, I'm assuming that the diamonds and drops are just for decoration.

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Digital Caliper, Adoric 0-6" Calipers Measuring Tool - Electronic Micrometer Caliper with Large LCD Screen, Auto-Off Feature, Inch and Millimeter Conversion

Product ID: 760522374

Details

Brand
Adoric
Material
Plastic
Measurement Accuracy
±0.2mm/±0.01”
Product Dimensions
9.45"L x
Range
0-6 Inches

📏0-6" / 150mm range

🔋Auto-off saves battery

🔍0.01" / 0.1mm resolution

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€ 20.95

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure Like a Pro, Every Time!

SMART ZERO SETTING - Reset measurements anytime with a simple button press for differential accuracy.
INSTANT UNIT CONVERSION - One-touch inch/mm toggle keeps you moving without missing a beat.
CLEAR EFFICIENT DISPLAY - Large LCD screen ensures quick, error-free readings plus auto-off to extend battery life.
VERSATILE MEASURING MODES - Seamlessly measure inside, outside, depth, and step dimensions with dual jaws and probe.
PRECISION AT YOUR FINGERTIPS - Ultra-accurate ±0.2mm measurements for flawless DIY and professional projects.

The Adoric Digital Caliper offers precise 0-6 inch (0-150 mm) measurements with 0.01"/0.1 mm resolution and ±0.2 mm accuracy. Featuring four measuring modes, instant inch/mm conversion, a large LCD screen, and an auto-off function, it’s engineered for durability and efficiency in both professional and DIY settings.

Specifications

ASIN	B07DFFYCXS
Best Sellers Rank	#1,179 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Digital Calipers
Brand Name	Adoric
Customer Reviews	4.5 4.5 out of 5 stars (37,722)
Included Components	digital caliper
Item Dimensions L x W	9.45"L x 3.07"W
Manufacturer	Guilin ahead measuring tool manufacturing co.,ltd
Material Type	Plastic
Measurement Accuracy	±0.2mm/±0.01”
Model	KC24
Number of Batteries	1 LR44 batteries required.
Part Number	B07DFFYCXS
Range	0-6 Inches
Set Name	Adoric Digital Caliper Series
Unit Count	1.00 Count

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