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MonitorMark™ Ascending Temperature Indicators

Product Features

  • Single-use temperature strip
  • Available in short-run, long-run, single- and dual-temperature models
  • Detects when the monitored environment reaches the specified threshold temperature
  • Short-run (up to 48 hours) models: 5°C, 10°C, 26°C,
  • Long-run (1 week) models: 10°C, 31°C
  • Dual model: 10°C for 2 weeks and 34°C for less than one hour
  • Easy to activate and interpret results
  • Preconditioning is required; special storage is not required
Download Product Spec Sheet
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3M MonitorMark Ascending Temperature Indicators

The MonitorMark single-use temperature indicators provide evidence of ascending temperature exposures. Available in several single and dual models, they utilize a chemically activated, irreversible dye color change that occurs when the monitored environment reaches a specified threshold temperature (+/-1°C). The Monitor Mark monitors the approximate duration (hours or days depending on the model) that the product has been exposed to the threshold temperature.

Instructions for Use

Storage: The shelf life of the MonitorMark is two years from date of manufacture.

Pre-conditioning: To prevent a false positive response, the MonitorMark must be conditioned prior to activation. This ensures that the response chemical is solid rather than liquid prior to removing the activation strip. The indicator must be conditioned for a minimum of two hours in a suitable refrigerator, freezer, or chamber at the temperatures listed in the table on the reverse side. Once conditioned and ready-for-use,

the indicators must be maintained below the threshold temperature. The payload being monitored also must be maintained below the threshold temperature. Without this precaution, heat from the product could cause a false positive response.

Application: Peel off the liner on the back of the indicator, and secure the MonitorMark on a clean, dry surface inside the shipping container or on the product. Remove the activation strip to allow direct contact between the indicator strip and the reservoir pad.

Interpretation of Results: The appearance of any shade of blue in the indicator's first window signals that the specified threshold temperature has been exceeded. The distance that the dye travels across the indicator's windows is called the runout. A response card (enclosed with each shipment) is used to evaluate the maximum amount of time that a product has been exposed to a threshold temperature (e.g. 5°C for 30 hours).

MonitorMark Specifications
Temperature Accuracy ±1°C/2°F
Runout Accuracy ±8% of Target Maximum Established for Indicator
Shelf Life Two Years from Date of Manufacture
Dimensions 3.75” x 0.75” x 0.094” (W x H x Thickness)
Backing High-Performance Pressure-Sensitive Adhesive with Peel-off Release Liner
Indicators per Case 500
Minimum Order 1 Case
Storage Recommended 22°C/72°F at 20-60% RH
Pre-Conditioning Information
Indicator Response Temperature Conditioning Temperature (2 Hours Minimum)
5°C (41°F) -4°C (25°F) or freezer
10°C (50°F) 5°C (41°F) or freezer
26°C (79°F) 22°C (72°F) or refrigerator
31°C (88°F) 27°C (81°F) or refrigerator

3M MonitorMark Time Temperature Indicators

Product Number Description Indicators
per Case
1 Case
Price per Indicator
10 Cases
Price per Indicator
9860B (formerly 5l) 5°C (41°F) 48 hours 500 $1.88 $1.57
9860C (formerly 10l) 10°C (50°F) 48 hours 500 $1.88 $1.57
9860D (formerly 10L) 10°C (50°F) 1 week 500 $1.88 $1.57
9860E (formerly 26l) 26°C (79°F) 48 hours 500 $1.88 $1.57
9860H (formerly 31L) 31°C (88°F) 1 week 500 $1.88 $1.57

3M MonitorMark Dual Temperature Indicators

Product Number Description Indicators
per Case
1 Case
Price per Indicator
10 Cases
Price per Indicator
9861A (formerly 42AA) 10°C (50°F), 2 weeks,
34°C (93°F), < 1 hour
500 $3.69 $3.39

Note: Indicators are sold by the case. Prices are for U.S. domestic sales only.