When evaluating an Inbody analyzer, prioritize Multi-Frequency BIA Technology. High-end models should use at least three different frequencies (e.g., 5kHz, 50kHz, 250kHz) to accurately measure intracellular and extracellular water. Ensure the device features an 8-Point Tactile Electrode System (two for each hand and foot) to eliminate contact resistance and provide Segmental Lean Analysis for each limb and the trunk. For clinical or high-end fitness applications, look for a Reactance and Phase Angle measurement capability, which is a critical indicator of cellular health and integrity.