Sono-Vario, the TDR moisture sensor

Sono-Vario is different. Eliminate slump variation by measuring moisture in your coarse stone!

Sono-Vario video



  • Precalibrated, no need for on-site calibration.
  • 15 choices, sand to coarse aggregates.
  • Auto-calibration as it wears.
  • High accuracy on coarse aggregates.
  • Measures 1-1/4″ rock with 0.2% accuracy.
  • Digital and analog outputs.
  • Face-plate is replaceable.
  • Read more on Sono-Vario.
  • Find out about Moisture Measurement.
Sono-Vario measures up to 1-1/4" stone with 0.2% accuracy, does not need calibration and has 15 selected calibratuions for different sizes of particle.
Sono-Vario sensor in aggregate stream from hopper
“The probe is working great, it saves me a lot of time. I very much enjoy using it and hope to use it for years to come.”- Patrick Weaver, Asphalt Plant Management


Imko, Germany, in collaboration with the Bauhaus University in Weimar, has designed Time Domain Reflectometry sensors for on-line aggregate moisture measurement. Consequently, you can achieve high repeatability and accuracy by using these new-technology sensors. New generation TRIME® TDR technology paired with 30-years of sensor development, know-how and moisture measurement experience will save you time and money as a result.



Concrete production, including ready-mix and precast, and asphalt production. You can install the moisture sensor on a separate mounting plate below a clam-gate or on a conveyor or weigh-belt.


Sand, gravel, rock, and crushed stone aggregates up to 1-1/4 inch diameter

“It’s a no news is good news scenario. Cameron [the operator] is happy, I’m happy, and we aren’t having any bad loads. I’m ready to start convincing others in this company to use the sensors.”
-Rod Leber, Manager, General Testing Lab.