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 Measuring Tool, 12 Inch Stainless Steel Micrometer

Product ID: 557071474

Details

Brand
Kynup
Material
Stainless
Measurement accuracy
±0.001”
Product dimensions
13.5L x 43W
Range
0-12 inches mm

💧IP54 splash-proof stainless steel

📏12-inch/300mm range

🔧±0.0015”/0.03mm precision

Description

📐 Elevate your precision game—measure like a pro, every time!

BUILT TO ENDURE - Crafted from premium stainless steel with IP54 splash-proof design—built tough for any workshop or job site.
PINPOINT ACCURACY - Experience ultra-fine measurements with ±0.0015”/0.03mm accuracy—because details matter in every project.
TRIPLE UNIT MASTERY - Seamlessly switch between inches, millimeters, and fractions with one button—precision tailored to your workflow.
SMART POWER MANAGEMENT - Auto shut-off after 6 minutes saves battery life, keeping you ready for the next critical measurement.
VERSATILE MEASUREMENT MODES - Measure depth, step, internal and external diameters effortlessly with four distinct measuring jaws and probes.

The Kynup 12-inch digital caliper combines professional-grade stainless steel durability with IP54 splash-proof protection and a large LCD for easy reading. It offers ultra-precise measurements with ±0.0015”/0.03mm accuracy across four measuring modes and three unit conversions, making it the ultimate tool for DIYers, woodworkers, jewelers, and professionals seeking reliable, versatile, and accurate dimensioning.

Specifications

ASIN	B09KGHRKHY
ASIN	B09KGHRKHY
Batteries	1 CR2032 batteries required. (included)
Best Sellers Rank	#26,943 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Digital Calipers
Brand Name	Kynup
Customer Reviews	4.5 4.5 out of 5 stars (167)
Customer reviews	4.5 4.5 out of 5 stars (167)
Date First Available	18 May 2023
Included Components	Screws
Item Dimensions L x W	13.5L x 43W centimeters
Item Highlight	Vernier Dial Caliper Tool with Inch/Metric/Fraction Conversion, Auto-Off & IP54 Splash Proof for DIY & Industrial Use
Item Weight	1.62 Pounds
Item model number	170-4
Manufacturer	Kynup
Manufacturer	Kynup
Material Type	Stainless Steel
Measurement Accuracy	±0.001”
Model	170-4
Number of Batteries	1 CR2032 batteries required. (included)
Number of Items	1
Part Number	12INDCQC10271007
Product Dimensions	38.99 x 10.21 x 1.47 cm; 734.82 g
Range	0-12 inches, 0-300 mm inches, millimeters
Unit Count	1.0 Count

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