TELLI is available from CP Lab Safety. Keep your lab safe from spills and overflow! Telli is a “non-contact” liquid level measuring device, meaning there is no risk of cross-contamination or chemical exposure. It affixes to the outside of the chemical waste container. Telli “talks” to the user, alerting everyone that the container is nearly full.

Telli, the Talking Electronic Liquid Level Indicator, uses radio waves to tell when a vessel is nearing maximum capacity and alerts you to empty the container before dangerous spills occur. Powered by a USB cable, Telli can use any USB power brick or computer port.

Features and Benefits

  • Easy to set up and maintain
  • Prevents overflows
  • UL tested for non-sparking
  • Great for use on HPLC waste containers
  • Works on glass and plastic containers
  • Fits containers as small as 500mL and as large as 55 gallon
  • includes 8′ USB cable


  • 1.5″ diameter by 0.5″ thick
  • ABS plastic outer
  • Elastic band stretches up to 18″ diameter

How to use

  1. Place the Telli against your waste container and secure with elastic band. Choose a location near the top of the container, based on your fill rate (Example: for slow HPLC waste processes, you can place the Telli higher on the vessel than for faster filling processes that require more time to react before overflow occurs.)
  2. Turn the Telli on by pressing the power button once.
  3. When the liquid level reaches the height of the Telli, a voice will alert the user to empty the vessel.
  4. Press the power button 6 times for a full reset.

Order TELLI from CP Lab Safety as a single item or as part of a solvent waste system. The CP Lab Safety team can also design a custom waste solution for you. Give us an overview of what you are looking for, and our staff will put together a quotation based on your precise requirements.