WarmMark® Duo Ascending Temperature Indicator

WarmMark® Duo Ascending Temperature Indicators

WarmMark® Duo indicators provide clear, irreversible visual evidence of cumulative temperature exposure above defined thresholds. The Duo format combines two calibrated temperature thresholds in a single indicator, helping you monitor cold chain performance and identify temperature excursions during transport or storage.

How It Works

WarmMark® indicators use a calibrated chemical reaction to detect temperature exposure above their rated thresholds. When exposure above a threshold occurs for long enough to represent a meaningful excursion, the corresponding indicator window changes permanently, providing a simple visual record that an out-of-spec temperature event has occurred.

The Duo format contains two thresholds in one unit, enabling a two-level indication that supports acceptance checks, quality investigations, and carrier accountability.

Duo Threshold Model

• 10 °C / 34 °F (Duo thresholds)

The WarmMark® Duo format provides two calibrated points of indication within one indicator to support more informative decision-making on receipt.

Pack Options

• 10 Pack
• 100 Pack

Typical Applications

• Pharmaceutical and medical device shipments
• Diagnostics, reagents, and laboratory supplies
• Temperature-sensitive consumables and components
• Cold chain lane testing and validation shipments
• Quality investigations and carrier performance review

Key Features

• Two-level (Duo) temperature excursion indication in one indicator
• Irreversible visual record for compliance and documentation
• No batteries, electronics, or calibration required
• Simple to apply and easy to interpret on receipt
• Supports acceptance checks, investigation, and accountability

Use & Handling Clauses

• Placement: Apply the indicator to a clean, dry surface on the outside of the package where it can be inspected on receipt. Avoid placement where it may be rubbed, crushed, or obscured by labels, strapping, or handling.
• Activation & Interpretation: WarmMark® provides a visual indication that the rated threshold(s) have been exceeded. It does not record the exact time, duration, or maximum temperature reached.
• One-Time / Irreversible: Activation is permanent and intended for one-time monitoring. Indicators cannot be reset or reused.
• Environment: Avoid exposing indicators to conditions outside intended use (e.g., direct sunlight, heaters, chemical vapours, or persistent condensation) that could affect readability or handling.
• Inspection & Records: Inspect and record indicator status at dispatch and on receipt. Photographing the indicator in situ is recommended for quality and compliance records.
• Suitability & Liability: Indicators do not prevent excursions or guarantee product condition. They support decision-making and investigation; users must validate suitability for their application, packaging design, and SOPs.

Compliance & Manufacturing

WarmMark® indicators are manufactured by SpotSee®, a global leader in condition-monitoring solutions. They are trusted worldwide for quality assurance, regulatory compliance, and cold chain integrity verification.

Stock Availability & Lead Times

WarmMark® indicators are manufactured by SpotSee® and supplied subject to availability. Stock levels may vary by threshold model and pack size. While some variants may be available for immediate dispatch, others may require additional lead time.

If you have a specific delivery requirement, are placing a larger quantity order, or need confirmation of availability for a particular variant, please contact us before ordering so we can confirm current stock levels and lead times.