Compact Instantaneous Threshold Indicators are used to monitor heat sensitive products from manufacture to product use or during shipping and storage. These Instantaneous Threshold Indicators function with response temperature of 40 Degree C and above in 5 Degree C increments with accuracy of +2 Degree C and instantaneous response time. These Instantaneous Threshold Indicators are featured with a marker that warns the user if the product has been exposed to a potentially damaging heat threshold temperature instantaneously. Compact Instantaneous Threshold Indicators come in different specifications to cater to specific requirement.