To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Used these to syringe feed a poorly guinea pig. They are great quality & much cheaper than I paid to buy one from the vet. Also can stand up to being washed in the dishwasher without losing the measuring guide.