Ghost Radar: EMF Detector

Power it on. Hold still while it samples the room. Then watch the scope.

Ghost Radar turns your phone into a hardened field instrument. The EMF bar shows the real strength of the magnetic field around you, in microtesla, straight from the magnetometer, with a needle that has weight: it overshoots on a spike and settles like a moving-coil meter. The noise gauge listens to the room's level. The motion gauge knows when your hand is not steady. Over all of it, the scope: a phosphor sweep, returns that appear at the rim, drift, and sometimes come in. When one gets close, the image tears, the device buzzes in your hand, and a word comes through on the communication strip.

THE INSTRUMENT
• Boot sequence with self-test, sensor check, audio input and baseline calibration, every time you power on.
• EMF bar in µT with deviation and rate of change, peak-hold mark, five sensitivity settings.
• Radar scope with sweep, phosphor persistence, up to three returns, flicker and tearing on events.
• Noise gauge (microphone level only, optional) and motion gauge.
• Communication strip: names, feelings, places, warnings, in your language.
• Synthesized ambience: transformer hum, counter clicks that follow the field, a ping on every sweep, static bursts and whispers on contact. Use headphones.
• Haptics on events only. Film grain, scanlines, brushed metal, scratched glass.

THE LOG
• Every investigation is written down: time, duration, peak EMF, peak noise, returns, contacts, the words and when they came.
• Name the place afterwards. Share a log card as an image.
• The returns and the words are decided by the session's seed and the variance of your own sensors: the same room, held the same way, answers the same way.

ALSO
• No account, no server. Nothing you measure leaves the phone. The microphone is used for its level only and never records.
• Works in any language of the nine; phones without a magnetometer run in accelerometer mode.
• Ads only on the home screen and in the log, and before a new investigation. Boosts and the second channel are optional.

TWO MORE INSTRUMENTS (1.1)
• REM-pod: a black puck with a telescopic antenna and five lamps. Set it down and take your hand away: the lamps light one by one and the tone climbs as something nears the antenna. All five is the alarm.
• Music box: wind the key, watch the brass presence dial in the lid. When the needle crosses the red mark, the comb plays a melody written for this app, slowing as the spring runs down.
• Both write to the same log and share card; pick the instrument on the home screen; each has its own sensitivity in Settings.

For entertainment purposes. The scope and the words are generated by the app.