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!

POWER SMART AUTO OFF - Saves battery life by shutting off after 5 minutes of inactivity—never get caught powerless.
SEAMLESS UNIT SWITCHING - Instantly toggle between inches and millimeters with a single button press.
DURABLE READY FOR ACTION - Rugged carbon fiber composite body with IP54 waterproofing for long-lasting, rust-free use.
VERSATILE MEASUREMENT MODES - Measure outer, inner diameters, depth, and steps with one sleek tool.
PRECISION AT YOUR FINGERTIPS - Ultra-accurate ±0.2mm resolution ensures flawless measurements every time.

The Adoric Digital Caliper is a professional-grade 0-6 inch (0-150 mm) measuring tool featuring ±0.2mm accuracy and 0.01" resolution. Its large LCD screen offers clear readings, while easy inch/mm switching and zero calibration enhance usability. Built with durable carbon fiber composite and IP54 waterproofing, it’s designed for precision and longevity. Dual batteries and an auto-off feature ensure reliable, energy-efficient performance for all your detailed measurement needs.

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Manufacturer	Adoric
Part number	GRE
Item Weight	100 g
Product Dimensions	12 x 6 x 1.27 cm; 100 g
Batteries	1 CR2 batteries required. (included)
Item model number	GRE
Size	6"
Color	Red Plastic
Material	Plastic
Power source type	Battery Powered
Measurement Accuracy	± 0.2 mm
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Manganese Dioxide

Adoric 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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