--- title: "Hardness Conversion Master - Reviews, Revenue and Downloads in Vietnam | Apple App Store" description: "A professional hardness conversion tool specifically designed for mechanical engineering, metal heat treatment, and quality management applications, offering rapid, stable, and traceable engineering r" --- # Hardness Conversion Master — Vietnam > STM Hardness Converter Pro ![Hardness Conversion Master App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/24/2b/36/242b3610-156d-b431-fc2f-841863e9190a/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/434x0w.png) **Developer:** [POYU WANG](https://apptail.io/developer/poyu-wang-SRgNNb) **Category:** Utilities **Rating:** N/A (0 ratings) **Price:** Free **Bundle ID:** -FHA5HG7K9.---- **Store:** Apple App Store **Country:** Vietnam **Version:** 1.1.1 (released 2026-08-27) **Original Release:** 2026-03-17 **Languages:** English, French, German, Hindi, Italian, Japanese, Korean, Polish, Portuguese, Chinese, Spanish, Thai, Turkish, Vietnamese **App Store Link:** [Download on Apple App Store](https://apps.apple.com/vn/app/app/id6760411989) **AppTail Page:** [https://apptail.io/app/hardness-conversion-master-XQKz/vietnam](https://apptail.io/app/hardness-conversion-master-XQKz/vietnam) ## Hardness Conversion Master Description A professional hardness conversion tool specifically designed for mechanical engineering, metal heat treatment, and quality management applications, offering rapid, stable, and traceable engineering reference data. [Core Features] 1. Industrial-Grade Precision The conversion logic is based on the ASTM E140 / ASTM A370 reference framework, utilising high-density reference points and linear interpolation to provide stable and reproducible conversion results. 2. Arbitrary Field Input and Real-Time Synchronisation You can directly input into any hardness field (e.g., HRC / HV / HBW), with all other units synchronising in real-time, enhancing operational efficiency on-site. 3. Physical Range Protection Mechanism Built-in checks for the effective range of each scale display "No Reference Value" when out of range, reducing the risk of misjudgement. 4. Customisable Interface Units can be toggled on/off and reordered by dragging, creating a workspace tailored to individual or production line processes. 5. Image Conversion (Beta) Supports photo/album import, area selection recognition, result comparison, and manual correction, suitable for quick conversion of reports and on-site records. 6. Batch Conversion Allows for the input of multiple data entries for quick conversion, retaining the last used unit preferences to minimise repetitive operations. [Supported Units] • Rockwell: HRC, HRA, HRB, HRD, HRF • Superficial Rockwell: HR15N, HR30N, HR45N, HR15T, HR30T, HR45T • Brinell: HB, HBW • Vickers: HV • Tensile Strength: MPa ## Hardness Conversion Master Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/cc/dd/86/ccdd8607-652f-2cf0-3487-66bf1cebbd62/Gemini_Generated_Image_95ak6e95ak6e95ak.png/1242x2688.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/df/2a/0b/df2a0bad-2657-40d4-5b31-3d210c2d0094/IMG_2682.png/1242x2688.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/08/85/58/088558af-5144-ba3a-d0f9-24972b03454a/IMG_2685.png/1242x2688.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/12/1d/87/121d8778-3a7d-ed48-2670-b8b6b0cc2a40/IMG_2683.png/1242x2688.png) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d6/67/2d/d6672d9c-6fc2-a827-a133-bc3bc95712ba/IMG_2684.png/1242x2688.png) ## Hardness Conversion Master Available In - [Armenia](https://apptail.io/app/hardness-conversion-master-XQKz/armenia) - [Bulgaria](https://apptail.io/app/hardness-conversion-master-XQKz/bulgaria) - [Brunei](https://apptail.io/app/hardness-conversion-master-XQKz/brunei) - [Cyprus](https://apptail.io/app/hardness-conversion-master-XQKz/cyprus) - [Germany](https://apptail.io/app/hardness-conversion-master-XQKz/germany) - [Finland](https://apptail.io/app/hardness-conversion-master-XQKz/finland) - [France](https://apptail.io/app/hardness-conversion-master-XQKz/france) - [United Kingdom](https://apptail.io/app/hardness-conversion-master-XQKz/united-kingdom) - [Grenada](https://apptail.io/app/hardness-conversion-master-XQKz/grenada) - [Croatia](https://apptail.io/app/hardness-conversion-master-XQKz/croatia) - [India](https://apptail.io/app/hardness-conversion-master-XQKz/india) - [Iceland](https://apptail.io/app/hardness-conversion-master-XQKz/iceland) - [Jordan](https://apptail.io/app/hardness-conversion-master-XQKz/jordan) - [Japan](https://apptail.io/app/hardness-conversion-master-XQKz/japan) - [South Korea](https://apptail.io/app/hardness-conversion-master-XQKz/south-korea) - [Lithuania](https://apptail.io/app/hardness-conversion-master-XQKz/lithuania) - [Madagascar](https://apptail.io/app/hardness-conversion-master-XQKz/madagascar) - [North Macedonia](https://apptail.io/app/hardness-conversion-master-XQKz/north-macedonia) - [Macao SAR China](https://apptail.io/app/hardness-conversion-master-XQKz/macau) - [Netherlands](https://apptail.io/app/hardness-conversion-master-XQKz/netherlands) - [Norway](https://apptail.io/app/hardness-conversion-master-XQKz/norway) - [Oman](https://apptail.io/app/hardness-conversion-master-XQKz/oman) - [Poland](https://apptail.io/app/hardness-conversion-master-XQKz/poland) - [Russia](https://apptail.io/app/hardness-conversion-master-XQKz/russia) - [Slovenia](https://apptail.io/app/hardness-conversion-master-XQKz/slovenia) - [Suriname](https://apptail.io/app/hardness-conversion-master-XQKz/suriname) - [Thailand](https://apptail.io/app/hardness-conversion-master-XQKz/thailand) - [Tunisia](https://apptail.io/app/hardness-conversion-master-XQKz/tunisia) - [Türkiye](https://apptail.io/app/hardness-conversion-master-XQKz/turkey) - [Uganda](https://apptail.io/app/hardness-conversion-master-XQKz/uganda) - [United States](https://apptail.io/app/hardness-conversion-master-XQKz/united-states) - [Uruguay](https://apptail.io/app/hardness-conversion-master-XQKz/uruguay) - [Uzbekistan](https://apptail.io/app/hardness-conversion-master-XQKz/uzbekistan) - [Vietnam](https://apptail.io/app/hardness-conversion-master-XQKz/vietnam) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*