Screen Mirroring to iPhone vs Volt Drop Check & Plug

The app transmits the screen image from iPhone/iPad to another iPhone/iPad. In other words, it is a screen mirror for two iPhone (it is possible to broadcast the screen image simultaneously to several iPhones/iPads). The two devices use peer-to-peer Wi-Fi, which allows the devices to communicate directly, even if they are not on the same Wi-Fi infrastructure network. This technology is used by AirPlay®, AirDrop®, etc. In other words, Internet access or a Wi-Fi router is NOT needed. The maximum distance at which a connection can be maintained between two devices is about 20 foot. The app can work on iOS 12 and newer. This makes it possible to use older iPhone starting with the iPhone 5S and later. Two adjacent iPhones/iPads are connected automatically. To do this: • Launch this app on both devices. • Select a role for each device (sending a screen image or receiving a screen image). • Turn on Wi-Fi on both devices. • Start screen broadcast on the device that should share the screen image. Screen image sharing can be done to several devices (up to 5). In order to be able to connect several devices receiving the screen image ("mirrors") to one "screen", you need to select the required number of "mirrors" in the application settings on the device that shares the screen image. However, you cannot select a larger number of "mirrors" than you will use. If you connect several "mirrors", but one of the devices acting as a "mirror" cannot connect or does not receive the screen image, then in the "screen" settings you need to reduce the number of "mirrors" to the number of "mirrors" that receive the screen image. This prevents the connection of foreign devices that are nearby. In case of using several "mirrors" for several users, in the "screen" settings there is an option to lock changing the frame rate and image quality through the "mirror" settings. Please note that when connecting multiple "mirrors", the settings for transmitting the screen image change to the settings set on the "mirror" that was connected last. When the aspect ratio of the display of the "screen" and "mirror" is different, black margins are obtained. This is especially noticeable when broadcasting the screen image from an iPhone to an iPad. In this case, to enlarge the screen image to a size where there are no black margins, just quickly double-tap the "mirror" display (in the area where there are no settings elements and buttons). The enlarged image can be moved to the sides. If you double-tap the display again, the image will return to its original state. It is also possible to make an arbitrary increase in the image with two fingers, as when viewing a photo. For use when using the app to take photos or videos of yourself, the image can be mirror flipped. In the full version of the app, the frame rate and image quality are adjustable. With "Medium" image quality (the difference with the original is barely noticeable), the maximum frame rate (20* FPS) allows you to watch video transmitted from iPhone to another iPhone/iPad without jerking or delays (both devices must not be old). At "Good" image quality or when transferring an image with "Medium" quality from an iPad, only a low frame rate is available. * - iOS may not transfer screen frames to the app often enough, for example when scrolling. In this case, the frame rate will be lower. But when watching a video, the frequency of sending frames to the app is quite high. If one of the devices is old, then the frame transmission rate may not be sufficient, regardless of whether the device is receiving or sending frames.

Volt Drop Check & Plug is an iPhone-only electrical calculation toolkit for field electricians, maintenance technicians, and design engineers. Stop juggling paper tables, calculators, and spreadsheets — switch between tabs and get the answer you need in seconds. ■ What's inside 1) Voltage Drop Calculator • Inputs: supply voltage, load current (or power in W), cable length, conductor material (copper / aluminum), insulation (PVC 70°C, XLPE 90°C, heat-resistant PVC 105°C), circuit type (DC / 1-phase 2-wire, 3-phase 3-wire), power factor, and optional reactance. • Outputs: ΔV, drop %, terminal voltage, loop resistance, and assumed conductor temperature. • GOOD / CAUTION / NG verdict badge with a one-line explanation, improvement suggestions, risk notes, and basis notes. • Round-trip ×2 applied automatically for DC / single-phase; √3 factor applied for three-phase. 2) Cable Size Selection (reverse calculation) • From load current, voltage, cable length, allowable drop %, material, circuit type, power factor, and ambient temperature, get the minimum required conductor area and a recommended cable size. • Side-by-side comparison of common sizes with PASS / FAIL / BEST indicators. 3) Ampacity Calculator • From conductor material, size, installation method (free air / in conduit / bundled), insulation type, ambient temperature, and grouping count, see base ampacity with temperature and grouping correction factors. • Corrected ampacity plus a per-installation-method summary. 4) Breaker Selection Guide • From circuit current, circuit voltage, usage (general load / motor / lighting / IT·server), and phase (single / three), get a recommended rating (AT), frame size (AF), and type (MCCB / MCB / ELCB). • Earth-leakage (ELCB) recommendation is highlighted automatically where appropriate. Includes a type guide. 5) Power Calculator (W ↔ VA ↔ kVA ↔ var) • Convert between active power (W / kW), apparent power (VA / kVA), reactive power (var / kvar), and phase angle φ from voltage, current, and power factor. • Three input modes: V×A, W, or VA. Single-phase / three-phase switchable. 6) NEMA / IEC Plug Quick Reference • A searchable cheat sheet for plugs and connectors — useful for overseas sites and imported equipment. Filter by code, voltage, and more. ■ Designed for the field • One-tap Japanese / English UI toggle (selection is remembered). • All calculations run on-device — works reliably even with poor signal. • Clear separation of inputs and results, with verdict badges and plain-language notes. • iPhone-first layout tuned for one-handed use. ■ Great for • Field electricians and contractors • Facility and maintenance technicians • Plant and building-services engineers • Solar, energy-storage, and EV-charging designers • Teams working with imported or overseas equipment • Electrical students and trainees ■ Important Results are reference values based on generic targets (e.g., 3% voltage-drop goal, 5% maximum). Always follow your local codes, internal standards, and equipment specifications for actual design and installation.