FIT Rife III Dual-Application Frequency Device

Overview and Market History

The FIT III represents a major evolution in our product line from the FIT I, acting as a powerful combination of both the FIT I and FIT II by incorporating the full capabilities of both machines into a single unit. First brought to market in 2015, the FIT III was highly successful, with over 800 units of the original model sold. In 2021, an improved version was introduced to the market, at which point the original 2015 model was officially discontinued due to the closure of key component suppliers. Looking forward, the line continues to advance with a new USB-C equipped iteration launching in July 2026.

Core Design and Engineering

To accommodate its dual capabilities, the FIT III features a larger footprint than the FIT I and FIT II, engineered specifically for longer sessions and everyday reliability. The device relies on a high-capacity 18650 single-cell lithium-ion battery for efficient power management and long-lasting performance.

Internally, the FIT III is built around a streamlined, singular PCB architecture rather than a modular layout. The upgraded 2021 model introduced a major hardware leap: replacing the original 2015 model’s resistive screen and two brass jacks with a sleek, flush 4.3″ capacitive touchscreen and four composite banana jacks. This layout ensures a highly reliable connection and robust screen protection while preserving a user-friendly interface that customers trust.

Dual-Application Technology

What sets the FIT III apart is its unique ability to bridge the distinct mechanical differences of the individual FIT models:

• Handheld Electrodes (FIT I): Originally conceptualized in 2012, the FIT I was designed exclusively for handheld electrodes, delivering frequencies directly to the body via precise, skin-contact voltage pulses. It lacks the power configuration required to run a PEMF coil.

• PEMF Coil (FIT II): Conversely, first developed in 2021, the FIT II was engineered strictly for a PEMF coil. It delivers frequencies through low-voltage, high-current pulses tailored for the coil, making it entirely incompatible with handheld electrodes.

By mastering both power delivery requirements, the FIT III eliminates these individual compatibility limitations, allowing users to seamlessly choose which delivery method to utilize—either handheld electrodes or PEMF coils—from a single, comprehensive device.