How do you set the display where all the numbers are big? it shows a picture where there all big?

There is a select button to cycle though a choice of display options. There is also a zero button along with an on/off button (if my 78 y.o. memory serves me correctly). If that doesn't do what you want, I'm out of guesses. One observation might be that only whole and NOT fractional numbers appear large. Hope this helps.

What size screw is needed for battery cover? I tried jeweler screws but they are too small. I lost mine replacing battery.

I'm not sure but if you go to lowes or tractor supply I'm sure you'll find what you need fairly easy.

What is the casing of the digital readout made of? Plastic or metal?

The description says the housing is made of metal with a silver paint finish. Feel and weight suggests metal construction. It is heavier than others I have that are plastic.

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Kynup Digital Caliper, Caliper Measuring Tool Outside Micrometer, Vernier Dial Caliper, 6 Inch Caliper DIY Tool, Stainless Steel, IP54 Splash Proof, Inch Metric Fraction Switch, Large LCD Screen.

Product ID: 732010906

Details

Brand
Kynup
Material
Metal Steel
Number of Batteries
3 Lithium
Range
6 inches
UPC
791315414919

💧IP54 splash proof stainless steel

📏0-6 inch / 0-150 mm range

⚙️0.001-0.02 mm accuracy

Description

📐 Measure Like a Pro, Every Time!

BUILT TO LAST RESIST - Durable stainless steel frame with IP54 splash-proof rating for rugged use.
SMART POWER MANAGEMENT - Auto-off feature saves battery life, keeping you ready for the next project.
TRIPLE UNIT FLEXIBILITY - Seamlessly switch between inches, millimeters, and fractions with one button.
VERSATILE 4 IN 1 MEASURING - Measure depth, steps, internal & external diameters with dual jaws and probe.
PRECISION AT YOUR FINGERTIPS - Ultra-fine 0.001 mm resolution ensures flawless measurements every time.

The Kynup Digital Caliper is a professional-grade 6-inch stainless steel measuring tool offering ultra-precise readings with 0.001 mm resolution and 0.02 mm accuracy. Featuring a large LCD screen, IP54 splash-proof design, and easy unit switching between inches, millimeters, and fractions, it’s perfect for DIY enthusiasts and professionals alike. Its versatile jaws and probe enable multiple measuring modes, while smart auto-off functionality extends battery life.

Specifications

ASIN	B07X8JQ8L5
Brand Name	Kynup
Customer Reviews	4.6 4.6 out of 5 stars (8,981)
Item Weight	0.19 Kilograms
Manufacturer	Kynup
Material Type	Metal, Stainless Steel
Model Number	170-2
Number of Batteries	3 Lithium Metal batteries required. (included)
Part Number	USQC03301915
Range	6 inches
UPC	791315414919 791378538942

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