METER TEROS 12 User Manual (English)

Adrian JenkinsAug 17, 2025

What to do if my METER TEROS 12 Accessories sensor reading is too low or negative?

M
Mary WigginsAug 17, 2025
If your METER Accessories sensor shows a reading that's too low or slightly negative, consider the following: * Check the sensor cable and the 3.5-mm plug connector to ensure they're in good condition. * Verify the data logger wiring: brown should be the power supply, orange should be digital out, and bare should be ground. * Look for air gaps around the sensor needles, which can occur if the sensor wasn't inserted linearly or if it pushed material out of the way. * Also, make sure that the calibration equation you're using is right for the type of media you're measuring, as there are big differences between substrate calibrations.

METER TEROS 12 Specifications

General

Measurement Range (Volumetric Water Content)	0 to 100%
Resolution (Electrical Conductivity)	0.01 dS/m
Accuracy (Temperature)	±1°C
Resolution (Temperature)	0.1°C
Connector Type	3.5 mm stereo plug
Cable Length	5 m (standard)
Resolution (Volumetric Water Content)	0.1% VWC
Measurement Range (Electrical Conductivity)	0 to 23 dS/m
Measurement Range (Temperature)	-40 to 60°C
Operating Temperature	-40 to 60°C
Power	3.6 to 15 VDC
Output	SDI-12
Material	Epoxy, stainless steel
Accuracy (Volumetric Water Content)	±3% VWC typical in mineral soils using factory calibration, ±5% VWC in soilless media
Accuracy (Electrical Conductivity)	±10% of reading from 0 to 7 dS/m

Summary