Instruct: Classify a given review as either positive or negative.
Query: Very large margin of error

As received it read 40 degrees when set in a glass of slush (a mixture of crushed ice and water). I adjusted it to 32 degrees and then inserted it in a pan of boiling water. It read 202 degrees. Since slush is exactly 32 degrees and boiling water is 212 degrees I was very disappointed with it (using the above described technique is one way to accurately calibrate a thermometer). I wanted this item for yeast proofing but since the accuracy is so bad I won't be using it for that (I wanted something closer to 2 degree accuracy).