Item DescriptionSave time and money bringing transportation damage claims to a quick resolution with Labelmaster’s WarmMark™ Time/Temperature Tags. These are guaranteed to work within 1º above or below the response temperature, and actually melt and migrate down the track strip when shipments exceed it (30°C/86°F). When an acceptable internal temperature returns, the chemical migration stops. Window #1 has a run out time of less than 30 minutes. Window #2 has a run out time of two hours, and window #3 has a run out time eight hours. They are sold in cases of 100.