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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📐 Measure Like a Pro, Every Time!

RUGGED RELIABLE - Durable carbon fiber composite with IP54 waterproof and anti-rust design built to last in any workspace.
SMART POWER MANAGEMENT - Auto shut-off after 5 minutes of inactivity preserves battery life—stay efficient and eco-friendly.
SEAMLESS UNIT SWITCHING - Instant toggle between inches and millimeters with a single button press—no hassle, just results.
VERSATILE MEASURING MODES - Measure outer, inner diameters, depth, and steps with specialized jaws and probe for all your projects.
PRECISION AT YOUR FINGERTIPS - Ultra-accurate ±0.01” / 0.2mm resolution for flawless measurements every time.

The Adoric Digital Caliper offers professional-grade precision with a 0-6 inch (150mm) measuring range and ±0.01” accuracy. Featuring a large LCD screen, easy inch/mm conversion, and four versatile measuring modes, it’s designed for engineers, jewelers, and makers who demand reliability. Its IP54 waterproof rating and carbon fiber composite build ensure durability, while smart auto-off and dual batteries keep you powered through every project.

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Brand	ADORIC
Material	Carbon Fibre
Product Dimensions	24L x 7.8W Centimeters
Range	6
Measurement Accuracy	±0.01”
Number of Batteries	1 CR2 batteries required. (included)
Manufacturer	Adoric
Country of Origin	USA
Model number	GRE
Colour	Red Plastic
Item Weight	91 g
Batteries	1 CR2 batteries required. (included)
Item model number	GRE
Power Source	Battery Powered
Resolution	0.01 inch
Are batteries included?	Yes
Lithium battery energy content	0.72 Milliampere Hour (mAh)
Lithium Battery Packaging	Batteries contained in equipment
Lithium battery weight	3 Ounces
Number of lithium metal cells	1

Digital Caliper, 0-6" Electronic Caliper Auto - Off Feature with Large LCD Screen Vernier Caliper Conversion Measuring Tool for Length Depth Inner Outer Diameter Measuring

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