Testo 0646 1077 testoterm +77°C Irreversible Temperature Indicator Strips (50-Pack)

With a switching temperature of +77 °C and a rapid response time of under 2 seconds, these self-adhesive indicator strips provide permanent, irreversible temperature monitoring for quality control, process monitoring, storage, and transport.

Overview

The Testo 0646 1077 testoterm strips are single-point irreversible temperature indicators. Each strip changes colour from white to black when the surface temperature reaches +77 °C, with an accuracy of ±1.5 °C. The colour change is permanent, creating a clear, tamper-evident record that the threshold was exceeded.

What stands out

• Permanent colour change from white to black at +77 °C
• Fast response: colour change in less than 2 seconds
• Self-adhesive backing for easy attachment to surfaces
• Compact size: 50 x 18 mm per strip
• Pack of 50 strips for multiple measurement points

Technical details

• Switching temperature: +77 °C
• Accuracy: ±1.5 °C
• Number of temperature points per strip: 1
• Indicators per pack: 50
• Colour change: white to black
• Response time: < 2 seconds
• Adhesive type: self-adhesive
• Strip dimensions (L x W): 50 x 18 mm
• Operating principle: permanent colour change upon reaching threshold
• Storage temperature range: +6 to +25 °C
• Shelf life: 2 years from manufacturing date
• Material: heat-sensitive elements on carrier film
• Reversibility: no (irreversible)
• Minimum temperature for use: -30 °C
• Maximum temperature for use: +120 °C

Our verdict

A reliable, no-power solution for irreversible temperature indication. The +77 °C threshold and fast response make these strips ideal for verifying that critical temperatures have been reached or exceeded in industrial and logistics applications.