Est. delivery Wed, 28 May - Mon, 9 JunEstimated delivery Wed, 28 May - Mon, 9 Jun
Returns:
30-day returns. Buyer pays for return postage. If you use an eBay postage label, it will be deducted from your refund amount.
Condition:
NewNew
How does the plethysmograph work?. Each wave corresponds to a heart beat and the wave amplitude corresponds to the amount of blood flowing through the blood vessels. It is specifically designed for children although it is also suitable for people with small fingers.