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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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

Product ID: 370066507

Details

Brand
Adoric
Material
Plastic
Measurement accuracy
± 0.2 mm
Product dimensions
12L x 6W
Range
6

💧IP54 waterproof rating

📏0-6"/150mm range

🔍±0.01"/0.2mm precision

€ 33.23

Duties & taxes included

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📐 Measure Like a Pro, Every Time!

SMART ENERGY SAVER - Auto shut-off after 5 minutes of inactivity means your battery lasts longer—stay powered when it counts.
RUGGED RELIABLE BUILD - Crafted from carbon fiber composite with IP54 waterproof and anti-rust design—built to endure your toughest tasks.
SEAMLESS UNIT SWITCHING - Instantly toggle between inches and millimeters with a single button—perfect for global projects and specs.
VERSATILE 4 IN 1 MEASURING POWER - Measure outer diameter, inner diameter, depth, and steps effortlessly with specialized jaws and probe.
PRECISION THAT PROFESSIONALS TRUST - Achieve ultra-accurate measurements with 0.01"/0.1mm resolution and ±0.2mm accuracy—no guesswork, just confidence.

The Adoric Digital Caliper offers precise 0-6 inch (150mm) measurements with 0.01"/0.1mm resolution and ±0.2mm accuracy. Featuring a large LCD screen, easy inch/mm conversion, and four versatile measuring modes (outer, inner, depth, step), it’s engineered with durable carbon fiber composite and IP54 waterproofing. Auto shut-off and zero calibration enhance usability, while dual batteries ensure uninterrupted performance—ideal for professionals demanding accuracy and reliability.

Specifications

ASIN	B091HQLDWK
ASIN	B091HQLDWK
Batteries	1 CR2 batteries required. (included)
Best Sellers Rank	#17,801 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Digital Calipers
Brand Name	Adoric
Customer Reviews	4.4 4.4 out of 5 stars (1,163)
Customer reviews	4.4 4.4 out of 5 stars (1,163)
Date First Available	21 July 2021
Item Dimensions L x W	12L x 6W centimeters
Item model number	GRE
Manufacturer	Adoric
Manufacturer	Adoric
Material Type	Plastic
Measurement Accuracy	± 0.2 mm
Model	GRE
Number of Batteries	1 CR2 batteries required. (included)
Number of Items	1
Part Number	GRE
Product Dimensions	12 x 6 x 1.27 cm; 68 g
Range	6
Unit Count	1 Count

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