Maintenance of Nervo‐Scope® Meters & Frequently Asked Questions

Electronic Development Laboratories, or EDL, has proudly manufactured the Nervo‐Scope® for over 60 years, and the care and maintenance requirements for them have not changed a great deal. In the past, the most delicate part of the Nervo‐Scope® was the Analog meter (the small coil assembly with the red pointer attached). In the newer electronic versions, we have been able to alter the delicate nature of the Analog meter and produce a more robust design that is much more durable and reliable.

User care and maintenance for the Analog meter is to clean the glass face with non‐abrasive cleaners, and not to soak or spray a large amount of cleaning fluid on the face of the meter, since the meter is not hermetically sealed. The next most sensitive area of the Nervo‐Scope® is the detector heads (the thermocouples). This area consists of eight wires that are precision welded, cleaned, formed, and cemented into place with ceramic filler. These wires should not be moved or wiggled and all cleaning operations should be done parallel with the direction of the wires. Over the years, many questions have arisen as to what the correct cleaning solution should be and how often they require cleaning. Our recommendation is to clean them after every patient with Sporicidin® brand disinfectant (sold by EDL). Sporicidin® was chosen after extensive testing in our laboratories. In our tests it performed better than any alternative and caused no damage to any of the components of the Nervo‐Scope®. Some people use alcohol for cleaning the Nervo‐Scope® and although it may appear to be effective; it causes long‐term damage to the detector heads and does not have the germicidal effect of Sporicidin®. For additional information on Sporicidin® disinfectants please see our website at: www.edl‐ or www.nervo‐

The housing is made from a Nylon/ABS composite material that is injection molded and machined to arrive at the final product. Although the case is chemically resistant, it is not impervious to chemical attack. The case should be cleaned and disinfected using a Sporicidin® towelette.

The wing screw or thumbscrew for tightening the front end (for adjusting the detector width) must be tight enough that the detector heads will not inadvertently move during use. Tighten this screw only as much as your instrument requires; over tightening will result in premature failure of the locking mechanism. Do not lubricate the assembly since any lubrication will reduce the friction and increase the force necessary to lock the front end or prevent locking entirely.

The Nervo‐Scope® uses a battery. These instruments require one nine‐volt battery, depending on usage; it is capable of powering the instrument for up to one year. You should always change the battery at a maximum of a one‐year interval. Following a fixed replacement schedule will reduce the potential for battery leakage and damage to the Nervo‐Scope®.

The switches in the Nervo‐Scope® do not require any user maintenance; they are of an extremely reliable and long lasting design. Never spray cleaning solution directly into a switch; it could wash contaminants into the contact area or wash away the internal lubrication and cause permanent damage to the switch.

On the ETS‐7 and ETS‐8 instruments, beneath the front end is the socket for connecting the Analagraph® cable. If you are using the instrument without the cable plugged in, we recommend putting a dummy (unused plug) in place. These connectors are the same connector that all telephones use, and you may use either a four‐pin or a six‐pin plug. This will keep dirt from accumulating in the socket and possibly creating poor or intermittent contact.

There are two potentiometer adjustments on the ETS‐6, ETS‐7, and ETS‐8 Nervo‐Scopes®, but we do not recommend any user adjustments. If you are having a problem with your instrument, and it is not covered in the instruction booklet, please call our technical service department for support at: 434.799.0807, or refer to our website, www.edl‐, to get information on how and where to send your instruments in for repair or calibration.

If the need arises and you decide to send an instrument in to our repair department for a tune up, overhaul, or repair, the instrument must be well packaged and insured and complete contact information must be in the box with your instruments; please refer to our Repair & Calibration Sheet on the website, www.edl‐, for additional information.

In general, you should treat these instruments with the same care and concern you would with any high quality medical product. EDL’s instruments are designed to be portable and used wherever and whenever you need them! Nervo‐Scope® instruments have earned the trust and respect of Chiropractors worldwide and we are constantly striving to improve and meet the needs of the ever growing, and evolving, Chiropractic community.

Frequently Asked Questions:

Question: I went to use my Scope, but the pointer did not move?
Answer: Make sure you push the ON switch every time you pick up the instrument for a glide. Check the battery. Verify that the shorting switch is not in the short position.

Question: When I make a glide, the two legs move?
Answer: Check to be sure you tightened the thumbscrew, make sure there is a washer under the thumbscrew and that the serrated side is towards the housing.

Question: When I turn ON my Nervo‐Scope®, the pointer does not rest on Zero?
Answer: This is normal; it indicates that there is a temperature differential between the two detectors. The procedure or checking the detector balance is as follows:

  1. Push the shorting switch to the short position, turn the Nervo‐Scope® ON and place it into the EDL box, close the lid and the pointer should rest on Zero ± one division.
  2. Remove the Nervo‐Scope® and push the shorting switch into the non‐shortening position, place it back into the box, close the lid, let it sit for fifteen minutes or longer.
  3. Open the lid, turn the Nervo‐Scope® ON, and place it back in the box, close the lid.
  4. Wait one minute and the Nervo‐Scope® pointer should rest on Zero ± two divisions.
  5. When handling the Nervo‐Scope®, do not touch or blow on either detector. Only have the Nervo‐Scope® out of the box long enough to move the switch or turn it ON.

Question: Where do I send my Nervo‐Scope® for repair, recalibration, or refurbishing?
Answer: Please refer to EDL’s website: www.edl‐ for more detailed information on how to send your instrument in for evaluation; it should be sent (insured and with complete contact information inside your package) directly to:
EDL, Inc.
ATTN: Repairs & Calibration
244 Oakland Dr.
Danville, VA 24540 USA

*Please remember to well pack your instrument, with at least three inches of resilient packing on all sides, including the top and bottom. Include your name, address, email address, phone number, and any special needs or requirements that you may have. All work will be quoted before we proceed with the repair.

Question: My instrument might have been dropped, what do I do?
Answer: Visually inspect your Nervo‐Scope®. Make sure the pointer is on Zero; look at the detectors, and see that the small wires are all uniform and parallel. Verify that the glide caps are still in place on the ends of the detectors. Check that all of the switches move properly and appear to work. At this point, try the instrument and see if it works the way you are used to, if it does work as usual than everything is fine! If not, please send it in for repair (follow directions above, or refer to EDL’s website: www.edl‐

Question: Some of the wires on the detector look greenish, it this mold?
Answer: Not normally, although it is possible for mold to grow. It is usually “green rot,” a form of corrosion. Proper cleaning will keep the detectors working and looking good.

Question: I finished using my Nervo‐Scope®, but it will not turn OFF.
Answer: All of the electronic Nervo‐Scopes® have an automatic power off feature. They turn themselves OFF after approximately fifteen to thirty minutes from the last push of the ON button. Pushing the ON button merely resets the built in timer and keeps the instrument ON, it is not a toggle switch.

Question: When I pick up my Nervo‐Scope® to make a glide, the pointer seems to shift position as I move it.
Answer: Make sure that the instrument is OFF and place it flat on its back, verify that the pointer is resting on Zero, now turn the instrument so the detectors are parallel with the floor and see if the pointer is still on zero. Verify that the instrument is still off, the pointer should return to Zero ± two divisions through all of these positions; if it moves off zero it means the balance of the meter is off and it must be returned for repair. We hope this information helps you use your Nervo‐Scope® with more ease and confidence. EDL is here to assist in every way possible; if additional information is needed, please call 1.800.342.5335 or 434.799.0807, email: sales@edl‐,  or visit our website: www.edl‐