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Compare up to 10 devices across categories. Keep the purpose and the source beside the numbers.

Price market Show differing specs

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Lowest recorded store prices take priority over announced or launch prices, within the selected source market. Currencies use the dated EUR reference rates. Deposits and recurring charges are excluded from price order; missing prices stay last. Original price records remain visible.

At a glance

The differences that matter

Graphene EDA palm e-tattoo

Electrodermal activity research

Keep in mind EDA correlates with arousal; it is not a standalone mental-health diagnosis.

Graphene bioimpedance e-tattoo

Cuffless blood-pressure research

Keep in mind Published research performance is not consumer validation. Calibration and study conditions matter.

Published specifications and documented constraints. See the full comparison below for prices and sources.

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Graphene EDA palm e-tattoo versus Graphene bioimpedance e-tattoo
Frontier & researchAdd a model	Frontier & research · University of Texas at Austin / Texas A&MGraphene EDA palm e-tattooResearch prototype	Frontier & research · University of Texas at Austin / Texas A&MGraphene bioimpedance e-tattooResearch prototype
Prices · all markets	Price not verified 0 offer records & sources No verified price in this audit.	Price not verified 0 offer records & sources No verified price in this audit.
Designed for	Electrodermal activity research ↗	Cuffless blood-pressure research ↗
Form factor	Palm e-tattoo linked to wrist electronics ↗	Skin-adhered graphene e-tattoo with external electronics ↗
Material	Graphene electrodes ↗	Graphene electrode layer ↗
Interconnect	Overlapping graphene/gold serpentine ribbons ↗	Not applicable to this category
Readout	Rigid E4 wristband electronics ↗	Not applicable to this category
Placement	Palm ↗	Wrist over radial/ulnar arteries ↗
Publication	Nature Communications, 2022 ↗	Nature Nanotechnology, 2022 ↗
Retail Product	None identified ↗	None identified ↗
Measurement	Not applicable to this category	Bioimpedance ↗
Analysis	Not applicable to this category	Machine-learning blood-pressure estimation ↗
Availability	EDA correlates with arousal; it is not a standalone mental-health diagnosis.	Published research performance is not consumer validation. Calibration and study conditions matter.
Important context	Research prototype Research or prototype system. A demonstration or clinical trial does not establish a consumer release or a product you can order. EDA correlates with arousal; it is not a standalone mental-health diagnosis.	Research prototype Research or prototype system. A demonstration or clinical trial does not establish a consumer release or a product you can order. Published research performance is not consumer validation. Calibration and study conditions matter.
Editorial pick & release	No editorial ranking recorded	No editorial ranking recorded
Evidence	Manufacturer source Checked 2026-10-13	Manufacturer source Checked 2026-10-13

Battery claims use different conditions and are not a controlled benchmark. “Not verified” is an evidence gap, not a missing feature. Prices are dated regional snapshots. Deposits, bundles and historical launch prices are labelled. Brightness measurement methods and battery workloads vary by manufacturer.