Epithelial Volt/Ohm (TEER) Meter

Order code

Volume Discount

Non-destructively test for epithelial monolayer confluence in 2D cell cultures

  • Measures trans-epithelial electrical resistance or trans-epithelilal voltage
  • Compatible with 12 and 24 well culture plate systems out of the box
  • Includes industry standard STX2 hand held “chopstick” electrodes
  • Analog output for recording resistance or voltage measurements
  • Auto ranging from 0-10 KΩ
  • Battery powered
  • Manual TEER measurement of epithelial cells in 6, 12, 24 and 96* well plates
  • BNC output for data acquisition system
  • Compatible with EndOhm chambers
  • *96-well plate measurement requires an STX100 series electrode.


Click here to view the current Data Sheet.   


Order code Voltmeter Electrode Charger (800496)

Battery (91736)

1 k-Ω Test Resistor (91750)
EVOM2 0-10 kΩ Range Epithelial Volt/Ohm Meter


(Basic Electrode)

Yes Yes (Installed) Yes
91799 0-10 kΩ Range Epithelial Volt/Ohm Meter


(Basic Adjustable Gap Electrode)

Yes Yes (Installed) Yes
300523 0-100 kΩ Range Epithelial Volt/Ohm Meter



(Basic Electrode)

Yes Yes (Installed) Yes


  • You can verify performance and calibrate the meter for TEER function using provided test resistor
  • Battery powered meter is portable
  • A variety of accessory electrodes are available for measuring TEER in 6- and 96-well fixed (HTS) and removable well culture systems (See STX100 series and Endohm electrodes)


  • TEER and trans-epithelial voltage measurements in 2D cell cultures

Making TEER Measurements to Determine Cellular Confluence

The EVOM was the first instrument designed specifically to perform routine Trans Epithelial Electrical Resistance (TEER) measurement in tissue culture research. EVOM2 is the next generation, redesigned for ease of use. The EVOM2 not only qualitatively measures cell monolayer health, but also quantitatively measures cellular confluence. The unique electronic circuit of the EVOM2™ and the included STX2  electrode detect the confluence of the cellular monolayer. When combined with WPI’s Endohm chamber, the EVOM2 can also be used to perform more accurate quantitative measurements or lower resistance measurements like transendothelial electrical resistance measurements. 

Isolated battery power for 10 hours of use

The isolated power source of the EVOM2™ was specifically designed to avoid adverse effects on tissue and the formation of electrode metal deposits, even when it is plugged into a standard wall outlet. Now, the EVOM2™ is always on when you need it. In addition, its rechargeable battery allows up to 10 hours of mobile use.

Accurate reading every time

The four-and-a-half digit readout provides a range of 1-9,999 Ω. The included test electrode lets you calibrate the resistance measurements for an accurate reading every time. An analog BNC output is standard with the EVOM2™, providing an output port for recording data or remote display of the EVOM2™ output.

Electrode pair to measure voltage, pass current

EVOM2™ comes complete with the popular STX2 “chopstick” electrodes, 4 mm wide and 1 mm thick. Each stick of the electrode pair contains a silver/silver-chloride pellet for measuring voltage and a silver electrode for passing current. The small size of each electrode is designed to facilitate placement of the electrodes into a variety of standard cell culture wells. 

    STX2      STX3

       STX2              STX3

Frequently Asked Questions

EVOM2 Instruction Manual

EVOM2 Data Sheet


  • Will the EVOM3 work with Endohm’s?

Yes, but the 99672 adaptor is required or the new EVOM3 cable 99916.


  • Why would I want to use the blank function?

The blank feature is used when you want to subtract out any measurement that is not from the membrane, such as the electrode and fluid resistances.


  • Does the EVOM3 system automatically calculate TEER?

No, TEER measurement requires an area calculation. To compute TEER, divide the measured resistance by the appropriate surface area (below). For example, a 12 mm insert measures 565 Ω, the TEER is 565 Ω/1.13 or 500 Ω. 6 well plate (24 mm inserts) 4.53 cm2, 12 well plate (12 mm inserts) 1.13 cm2, 24 well plate 6.5 mm inserts) 0.3316 cm2, 96 well plate (4.3 mm inserts) 0.143 cm2.


  • EVOM3 data is stored automatically when the last well is reached. How do I store the data when I only want to measure 8 of 96 wells?

Clear any data in memory by opening settings, store menu then press new plate, that will clear any prior readings. Return to the main screen, open the preview screen, select each well to measure (the selection turns green), place the electrode, then measure. When you’re done measuring the selected wells, open the settings, press the store screen menu, then press store new to save the plate data to the USB drive.

Membrane Voltage Range +/-200 mv
Resolution 0.1 mV
Resistance Range 0 to 9999 Ω *   
Resistance Resolution 1 Ω
AC Square Wave Current +/- 10uA nominal at 12.5 Hz
Power Internal rechargeable 6V NiMH
2700 mAH batter with external
12VDC Supply for recharging
Nomimal Battery Run Time 10 hours
BNC Output  

1-10 V (1 mV/Ω)


Dimensions 19x11x6 cm (7.25x4.25x2.30")
Weight 1.4 kg (3 lb.)
Electrode Connection RJ-11 connector (telephone style)
Test Resistor External, 1000 Ω 
Environmental Range 10-38°C (50-100°F)
0-90% non-condensing relative humidity
Power Supply Universal 100-240 VAC, 120 VDC (5.5 x 2.5mm barrel positive tip), 850 mA

* 300523 is the part number for the EVOM2 with 10X the resistance range. Note that display on this unit reads in KΩ, and the display on the standard EVOM2 read Ω.

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Eigenmann, D. E., Xue, G., Kim, K. S., Moses, A. V., Hamburger, M., & Oufir, M. (2013). Comparative study of four immortalized human brain capillary endothelial cell lines, hCMEC/D3, hBMEC, TY10, and BB19, and optimization of culture conditions, for an in vitro blood-brain barrier model for drug permeability studies. Fluids and Barriers of the CNS, 10(1), 33. https://doi.org/10.1186/2045-8118-10-33

Ao, M., Sarathy, J., Domingue, J., Alrefai, W. A., & Rao, M. C. (2013). Chenodeoxycholic acid stimulates Cl(-) secretion via cAMP signaling and increases cystic fibrosis transmembrane conductance regulator phosphorylation in T84 cells. American Journal of Physiology. Cell Physiology, 305(4), C447-56. https://doi.org/10.1152/ajpcell.00416.2012

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More Information about the EVOM2

VIDEO: Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers

See how to use and EndOhm chamber with an EVOM2 meter. 

In this video Mike shows you how to equilibrate your STX electrodes.

In this video, you can learn how to test your EVOM2.

Cellular Confluency of Epithelial Cells

The original EVOM was featured in this application video.

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