Vernier Caliper is an app by Fometescu Octavian in the Education category. It includes native code only for ARM 32-bit, so it won't run on 64-bit-only phones such as recent Pixels.
It asks for 12 permissions, none of them sensitive. The app offers in-app purchases through Google Play and can read the advertising ID that ad and analytics services use.
Description
From the listing uploaded by “superpocket”.
Precision Measurement Simulator is an interactive virtual metrology laboratory for learning how to read and use vernier calipers, micrometers, dial indicators, comparators, gauge blocks and angle-measurement instruments.
Practice precision measurement with realistic virtual tools inspired by instruments used in mechanical engineering, machining, CNC training, manufacturing, dimensional inspection, quality control and technical education. Manipulate the instruments, read the scales, enter your answer and receive instant feedback.
Precision measuring instruments included
Vernier calipers
• Metric vernier caliper with 1/10, 1/20 and 1/50 vernier scales: 0.1 mm, 0.05 mm and 0.02 mm resolution
• Imperial vernier caliper with 1/128 inch scale
• High-resolution 0.001 inch vernier caliper
• Dial caliper with 0.02 mm resolution
• Digital caliper with 0.001 mm resolution, mm/inch conversion, ZERO/tare and zero-error simulation
Micrometers and comparative measurement
• Metric outside micrometer, 0–25 mm range and 0.01 mm resolution
• Imperial micrometer reading simulator
• Digital micrometer with 0.001 mm resolution, movable spindle, mm/inch conversion, ZERO/tare and zero-error simulation
• Passameter for comparing thicknesses, tubes and non-parallel surfaces
• External dial measuring instrument with 100 examples for grooves, shaft diameters, wall thicknesses and other parts
Dial indicators and comparators
• Mechanical dial indicator with adjustable stand, gauge-block setup and part measurement
• Digital comparator with movable probe, 0.01 mm resolution, mm/inch conversion, ZERO/tare and zero-error simulation
Gauge blocks and angle measurement
• Gauge block stack practice with standard 46-piece and 87-piece sets
• Vernier bevel protractor for mechanical angle reading
• Sine bar simulator with gauge blocks and interactive angle setup
Engineering and mechanical simulations
• Three-wire method for measuring the pitch diameter of external screw threads
• Centrifugal tachometer with rotating masses, spring, levers, toothed sector, pinion and pointer
• Bourdon tube pressure gauge showing tube deformation and mechanical motion transmission
• Venturi tube simulator for fluid flow, velocity, pressure difference, Bernoulli equation and differential U-tube manometer readings
Interactive learning features
• Realistic scale reading and instrument movement
• Metric and imperial measurement systems
• Random exercises and immediate answer feedback
• Guided explanations, visual indicators and optional spoken instructions
• Zoom, pan and touch controls for detailed inspection
• Portrait and landscape layouts for phones and tablets
• Multiple visual themes and a multilingual interface
• Clear representations of scales, graduations, verniers, dials and measuring surfaces
Designed for
• Mechanical engineering and manufacturing students
• Vocational schools, technical colleges and metrology courses
• CNC operators, machinists, apprentices and workshop beginners
• Teachers demonstrating precision measurement principles
• Quality inspection and dimensional measurement practice
• Anyone learning precision instruments and engineering measurement
Use the virtual laboratory to understand vernier scales, micrometer thimbles, dial readings, zero error, dimensional inspection, gauge-block combinations, thread measurement, angular measurement, pressure measurement, rotational speed and basic fluid mechanics.
Learn how measuring tools work before using real workshop instruments. Practice repeatedly, explore different examples and improve your confidence when reading precision scales.
This simulator is intended for education and training. It does not replace calibrated measuring instruments, professional inspection procedures or laboratory equipment.
Security & authenticity
Security rating: Trusted
Signing certificate
Certificate issued to “zph-mph”Not the developer's name (“Fometescu Octavian”). Names in certificates can't be verified, so this alone proves nothing.
Store checks and file details
Developer signature under reviewSep 5, 2026
Signed byCN=Jx Clarynx, O=zph-mph, OU=anon.org, L=Caraga, ST=Surigao Del Norte, C=8609
Uploaded by “superpocket”Silver tier · 5,272 followers · uploading since 2016
Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (12)
Vernier Caliper requests 12 permissions, none of them sensitive.
Access adservices ad idandroid.permission.ACCESS_ADSERVICES_AD_ID
Can I install this APK over the version I already have?
Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.
Is Vernier Caliper free?
The APK is free to download, but the app offers in-app purchases through Google Play.
Is the Vernier Caliper APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. After downloading, check that the file's MD5 is 7e1d31b502a8f96b0ab91d7071ddcc96.