CryoVeritas
Trust every tube.
Free evaluation kit Visual temperature indicators

See sample integrity the moment you open the box.

Pinktail provides irreversible visual proof of temperature excursions without the cost of electronics. If the color changes, it stays changed. No second-guessing.

  • No electronics. No calibration. No ambiguity.
  • Irreversible color change that stays pink even if refrozen.
  • Travels inside the box, right next to your vials.
Irreversible: once triggered, the change is permanent

Request your free evaluation kit

Use your institutional or corporate email to qualify.
Free 3-pack • No credit card • Ships via FedEx within 2 business days.

Trusted by leading research & biotech institutions

Broad Institute Arizona State University MassBio
"Finally, a way to verify dry ice shipments without digging through data loggers."
— Pilot user, Academic Core Facility
CryoVeritas indicator: Safe (pink) vs. Failed (clear) side by side
Safe: stays pink Failed: turned clear
Available signal temperatures
0 °C
−18 °C
−37 °C
−67 °C
Indicator Dimensions
Overall: 45.0 mm tall × 12.7 mm wide
Cap: 12.7 mm dia. | Tube base: 9.0 mm dia.
Designed to travel with samples in a cryobox well or on dry ice with shipments.
Pinktail 0°C indicator sample

What's in the kit

We'll send you a professional evaluation pack containing three Pinktail indicators at your chosen signal temperature. These are the same production-grade sensors used by global logistics teams to monitor high-value biologics and vaccines.

  • 3x Ready-to-use indicators
  • Instruction guide for activation
  • Reference card for state validation

Why teams use CryoVeritas

  • Travels with Samples

    Unlike external labels, Pinktail sits directly on your vials or trays inside the box.

  • Deep Freeze Ready

    Signal temperatures from −67°C to 0°C. Perfect for dry ice, ultra-low, and cold-chain shipments.

  • Irreversible Proof

    Once triggered, the color change is permanent, even if refrozen. You'll always know if a breach occurred.

How it works

1
Activate

Simply twist, then gently mix by flicking and shaking until the indicator turns deep pink.

2
Place

Set the activated indicator directly on your vials or trays inside the shipping box.

3
Verify

On arrival, check the tail. Pink means safe. Clear means the temperature limit was exceeded.

Verify My Shipments for Free Free evaluation kit • Ships within 2 business days

See Pinktail in action

Watch how easy it is to activate, place, and verify your indicator.

Heat response at a glance

At 25 °C, the indicator will remain pink for 15 minutes before turning clear.

Temperature Approx. Time Until Clear
25 °C ~15 min
4 °C ~3 hours
Below signal temp* No change
→ Higher temperatures → faster color change
→ Lower temperatures → slower color change
Indicators do not trigger at a single temperature. They respond to cumulative heat exposure over time. Heat exposure = Time × Temperature.
* Available signal temperatures: 0 °C, −18 °C, −37 °C, −67 °C. Times shown are for the 0 °C indicator at the listed ambient temperatures.