7-step Plastic Ruler Electrocardiogram Reading and Measuring Tool, Transparent Electrocardiogram, Portable Medical

Ayzeze: This device is not a substitute for professional medical advice, diagnosis, or treatment. Please consult a qualified healthcare professional before use if in doubt. The seller/distributor is not liable for any damages arising from misuse, unauthorized modification, or use beyond stated indications.

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High-concerned chemical : None Ruler Type : Straight Ruler Material : Plastic Origin : Mainland China Type : Ruler Model : Without slotting, with card slot