WPI Blog

World Precision Instruments is the leading manufacture of benchtop TEER instrumentation including the original equipment manufacturer of Millipore Millicell® ERS-2 (Part number MERS00002) and Millipore Millicell® ERS (Part number MERS00001).

WPI has manufactured TEER instrumentation, including the EVOM2, EVOM3, EVOM™ Manual, and Millicell® ERS-2 (a WPI OEM product), for over three decades. Millipore’s Millicell® ERS 3.0 recently became available and is NOT manufactured by WPI, nor validated or certified to be accurate for TEER measurement. WPI manufactured and validated product, like EVOM™ Manual, the proven gold standard for TEER measurement, ensure the accuracy and reproducibility of your work. Accept no substitutes.

Transepithelial/Endothelial Electrical Resistance (TEER) qualitatively measures cellular monolayer health and quantitatively evaluates cellular confluence by measuring the electrical resistance across a cell monolayer. It is commonly used to assess the integrity and permeability of cellular barriers, such as epithelial and endothelial cell layers in cell culture plates. Organ-on-Chip platforms are an emerging market for TEER applications. Let’s look at what TEER is and how it is used.

The EVOM™ Auto automates measurements of TEER in epithelial or endothelial monolayers cultured on 24-well or 96-well high throughput screening (HTS) plates utilizing our innovative EVOM technology, qualitatively measuring cell monolayer health and quantitatively measuring cellular confluence by reaching an increase or a plateau in tissue resistance. The autosampler has a 3-well rinse station for cleaning and stabilizing the electrodes. Now, sterile disposable rinse station inserts are available for your convenience. They fit over the 3-well base rinse station. You can simply throw out the disposable inserts with the solutions when you are changing plates. This short videos shows how easy they are to use.

Each NanoFil needle is individually handcrafted and made for versatility to serve your low-volume sample delivery needs. All needles are made with a universal 26G fixture to support and house each gauge of needle we offer: 33, 34, 35, and even 36G in blunt or beveled styles. WPI currently offers the smallest commercially available needles on the market—perfect for extremely sensitive targets, such as in ophthalmic applications. The universal fixture allows all needles to be used interchangeably across any NanoFil syringe.  Any NanoFil needle can be inserted directly into the barrel of any NanoFil syringe, creating a 1:1 connection with the plunger, resulting in virtually zero dead volume. The sealing gasket seating the needle to the syringe reinforces a tight, uniform fit for a truly gas tight environment. Our design compatibility supports your ever-evolving application needs across varying delivery volumes required. 

Get the highest quality images and video for your research with FluoroDish Cell Culture dishes. Their optical quality glass bottom is as thin as a coverslip, which ensures the least amount of distortions and excellent heat transfer without any of the autofluoresence issues so common with plastic petri dishes.  

Choose the style that suits your application. For live cell imaging, embryo research, and life science researchers working with small sample volumes, the 35mm Fluorodish petri dish with a 10mm well (FD3510) is ideal. Researchers working with expensive chemicals or experimental drugs choose the FD3510. They are also an excellent choice for microinjection applications, because they are designed with the lowest access angle for easier insertion of a micropipette during cellular microinjection. Fluorodishes are also available in 35mm (FD35) or 50mm (FD5040) sizes for cell culturing applications. For better adhesion of neurons, try the 35mm Fluorodish that is coated with poly-D-lysine (FD35PDL).

SARASOTA, Fla. and LYON, France, June 10, 2024 /PRNewswire/ -- World Precision Instruments (WPI), a leading provider of high-quality laboratory instruments and equipment for basic research and drug development, and NETRI, an organs-on-chip industrial start-up, are proud today to announce their partnership. This partnership aims to associate WPI's transepithelial electrical resistance (TEER) technology, and products enabling TEER, with NETRI's proprietary NeoBento organs-on-chip MultiFluidics™ line. WPI has long been at the forefront of developing technologies that enable and augment microphysiological systems and organs-on-chip applications. With a strong focus on enabling TEER, fluidics, and other vital technologies in this field, WPI is committed to advancing research and innovation in the life sciences for basic research and drug development.

Transepithelial Electrical Resistance (TEER) measurements play a vital role in assessing barrier function, tissue integrity, and cell-cell interactions in Organ-on-Chip (OoC) platforms. Measuring TEER by applying a small AC current across a monolayer of cells and measuring the resistance to that current, which provides valuable insights into the physiological relevance and functionality of in vitro models, enabling researchers to study organ-specific responses, disease mechanisms, and drug effects while cells are growing in a controlled microenvironment. This article will explore the applications of TEER in OoC set-ups, critical aspects to TEER measurements in microphysiological systems, and challenges and limitations that must be overcome to fully realize the potential of this technology for OoC platforms.

Tungsten carbide (TC) inserts have revolutionized the field of surgical instrumentation, offering benefits that make them a preferred choice. These inserts, typically made from a combination of tungsten and carbon, exhibit exceptional hardness, strength, and resistance to wear and corrosion, maximizing the lifespan of Surgical scissors, Forceps, and Needle holders.

Protect the investment you have made in surgical instruments and improve the outcomes of your surgeries by regularly inspecting your surgical scissors. Regular inspections ensure that your surgical scissors are in optimal working condition, allowing you to promptly identify and address common issues like dullness, misalignment, or damage. Inspections also help mitigate risks associated with the use of defective or damaged surgical scissors and promotes surgical safety, reducing the likelihood of adverse outcomes. By addressing minor issues early on and following regular cleaning, sterilization, and storage protocols, you can extend the usable lifespan of your surgical instruments, reducing the need for frequent replacements and the associated costs.

Cell therapies have revolutionized the field of regenerative medicine, offering promising treatments for a variety of medical conditions. Maintaining the safety, efficacy, and consistency of cell-based therapies is paramount for their successful application in clinical settings. Quality control measures play a vital role in evaluating the quality of these therapies, from development to administration. This article explores the current approaches to quality control in cell therapies, including the utilization of functional measurement techniques such as transepithelial electrical resistance (TEER), to ensure the quality and safety of these promising treatments.

Cell therapies have emerged as a promising approach for treating various medical conditions, offering the potential for regenerating damaged tissues, restoring normal cellular function, or even acting as cytotoxic cells that target and destroy diseased cells such as cancer cells. As the field of cell-based therapeutics and regenerative medicine continues to advance, ensuring the quality and safety of cell-based therapies is of paramount importance. Quality control measures play a critical role in the manufacturing process of cell therapies, with trans-epithelial electrical resistance (TEER) emerging as a valuable tool for assessing the integrity and functionality of cells used in these therapies. Here, we highlight the use of TEER for quality control of Retinal Pigment Epithelial (RPE) cells, a promising cell therapy for degenerative retinal diseases1.

The use of Disposable biopsy punches has become routine in a variety of industries, from healthcare to forensic science and manufacturing. These small but crucial instruments offer many benefits, ranging from convenience and sterility to cost-effectiveness and reliability.

Disposable biopsy punches are often preferred over reusable biopsy punches because of their convenience and cost-effectiveness. Reusable punches require sterilization between uses, which takes time and resources. Disposable punches streamline your workflow efficiency and enable you to focus your efforts on your results. For high-volume procedures, this can be critical.

Transepithelial electrical resistance (TEER) has emerged as a powerful tool in ophthalmology research and has become a standard method for study of retinal pigment epithelial (RPE) cell biology and the development of these cells as a therapeutic for retinal diseases such as Age-Related Macular Degeneration (AMD). The application of TEER in assessing the barrier function and integrity of RPE cell layers has significantly advanced our understanding of retinal diseases and paved the way for innovative therapeutic interventions including some of the most promising cell therapies to date. This article explores the use of TEER in ophthalmology research, with a focus on studies utilizing RPE cells for both research and clinical applications.

EVOM™ Auto, with both 24 and 96 HTS multiwell plate capability, is a high throughput screening (HTS) platform offering fast, noninvasive sample scanning by comparing electrical resistance measurements (transepithelial/transendothelial electrical resistance: TEER). TEER measurement experiments are simple to set up and less time consuming than more complex molecular studies. TEER measurement can be used as the primary scanning method to identify any physiological changes that can then be further evaluated by other methods. EVOM™ Auto can capture TEER measurements in 24 and 96 HTS multiwell plates from Corning, Millipore, or MatTek. The sample preparation time in these HTS plates is efficient, allowing for fast, multi-channel pipetting options.

The EVOM™ Auto autosampler ships with a red electrode array lock in place to prevent the electrode array connection port from moving during transit. Here you can see how to easily remove it without damaging the lock or the autosampler.

Below are some popular pullers from WPI, including Sutter pullers. Here we compare them so you can choose a system that is best suited for your application.

The WPSS01 skin stapler is an affordable, reliable solution for veterinary wound closures. A skin stapler is designed for the efficient closure of surgical incisions or wounds by applying surgical staples to the skin, reducing surgery time and time under anesthesia. Each disposable skin staple cassette contains at least thirty-five (35) 316L stainless steel staples.

Each reusable skin stapler handle is provided sterile with one disposable staple cassette already loaded into the handle. Discard the disposable staple cassette after the procedure. The reusable handle may be cleaned and resterilized (autoclave, EO) for subsequent procedures and will effectively deploy at least twenty (20) disposable staple cassettes and withstand at least twenty (20) autoclave cycles.

Choosing a dependable lab equipment supplier is crucial for ensuring the quality, reliability, and timely delivery of the equipment you require.  When your research is on the line, you need a company you trust, a supplier with a proven track record and a service team to back you up. Here are a few important considerations when selecting a lab equipment supplier.