Most iPhone peripherals aim low. They make the case a bit more durable or add a better speaker. They marginally improve a pretty darn good product.
The full Lapka sensor suite, along with its abstract viewing mode.
A steel probe checks for nitrates, which are commonly used in chemical fertilizers.
But Lapka is something totally different. It’s an appcessory billed as a “personal environment monitor,” and through its collection of four peripherals, Lapka gathers analog measures of humidity/temperature, radiation, electromagnetic frequencies (EMF) and organicity (whether or not a food is truly organic).