Proof your samples stayed frozen, the moment you open the box.
Pinktail is a small indicator that ships inside the box, beside your vials. If the shipment warmed past your limit, it turns clear and stays clear. No data loggers, no downloads, no guessing.
- Irreversible. Once triggered, it never turns pink again, even if refrozen.
- No electronics. No batteries, calibration, or software to read.
- Four signal temperatures: 0 °C, −18 °C, −37 °C and −67 °C for fridge, freezer, ultra-low and dry ice.
The full evaluation kit, free
The same production-grade indicators used to monitor high-value biologics and vaccines, at the signal temperature you choose.
- 3 ready-to-use Pinktail indicators
- Activation guide
- Reference card for reading each state
Know what happened to every box
External labels tell you about the outside of the package. Pinktail tells you what your samples actually experienced.
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Travels with the samples
Sits directly on your vials or trays inside the box, so it sees what they see.
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Deep-freeze ready
Signal temperatures from −67 °C to 0 °C cover dry ice, ultra-low and standard cold-chain shipments.
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Irreversible proof
Once triggered the change is permanent, even if the box is refrozen before it reaches you.
Three steps, no training
Anyone on the receiving end can read it at a glance.
Twist the cap closed, then flick and shake until the base turns deep pink.
Set it directly on your vials or trays inside the shipping box.
On arrival, check the base. Pink means safe. Clear means the limit was exceeded.
See Pinktail in action
Watch how easy it is to activate, place, and verify an indicator.
Heat response at a glance
Indicators respond to cumulative heat exposure (time × temperature), not a single reading. Warmer means faster; colder means slower.
| Ambient temperature | Approx. time until clear |
|---|---|
| 25 °C | ~15 min |
| 4 °C | ~3 hours |
| Below signal temperature | No change |
Times shown are for the 0 °C indicator at the listed ambient temperatures.
45.0 mm tall × 12.7 mm wide. Cap 12.7 mm dia., tube base 9.0 mm dia.
Fits a standard cryobox well or rides loose on dry ice.
Before you request a kit
Short answers to the things people ask before they fill out the form.