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90 Day Guarantee | Free Parts for Life and Lifetime Warranty

Frequently Asked Questions


Stethoscopes that have been engraved are not returnable. If you have received a stethoscope with an engraving error, please let us know and we can look into a replacement Bell. If your item arrives damaged or contains a manufacturer's defect, it is covered under our Lifetime Warranty. 

All returns must have an RMA number (Return Merchandise Authorization), so please contact us to receive this number. If an RMA number is not obtained prior to the return, a $5 handling fee will be applied. To request an RMA, please email sales@ausmedsupply.com.au and include the following information: original purchase number, name and the reason for the RMA request. Returns must be shipped within five business days after the RMA is issued. All returns must be received within 10 business days of the RMA being issued. We are unable to refund any import duties/tariffs, original or return shipping costs.

Returns may be subject to a 15% restocking fee.

We will not be able to offer a refund but we would be happy to offer an exchange and help find the perfect stethoscope for you.

We want you to love your stethoscope, so if you would like to make an exchange, please contact us with the order number at sales@ausmedsupply.com.au If there is a price difference, we will refund the difference on the original order or charge the difference if you would like to upgrade your MDF Instrument.

We kindly request that you pay for the shipping cost to return your order. If you have received an incorrect or defective product, we would be happy to cover the shipping cost for you. For any issues with shipping your item for return, please contact us.

Please allow us a few business days to process your return and initiate the refund. We will contact you with any questions on your return but once the refund is processed, it will take 2-5 business to post in your account, depending on your bank.

Payment Information

We accept Visa, MasterCard, American Express, PayPal and Apple Pay.

Taxes are included in the price.

Shipping Information

The shipping time will depend on the shipment method and delivery location. If you are uncertain if you will receive your product in time, please give us a call at 1300 770 921 and remember to take into consideration an additional three business days for processing.

We do not offer expedited shipping options at this time.


Yes, all MDF Instruments products are 100% latex free.

We do not sell face masks, face shields, PPE and oximeters at this time.

Lifetime Warranty

Our Stethoscopes (excluding the single-use line), Sphygmomanometers and Reflex Hammers have a Lifetime Warranty.

The Lifetime Warranty covers the entire stethoscope including the tubing, against defects in material and craftsmanship. Your stethoscope will be repaired or replaced without charge for the life of the instrument in case of defect. However, the Lifetime Warranty does not cover discolored tubing (not related to manufacturing defect), theft, loss, disposal, improper handling, accidents or failure to follow operating instructions.

To make a Lifetime Warranty request for a replacement headset and tubing, please register your stethoscope if you haven't already. You can register and make the request at online registration and service form or feel free to contacts us and we will complete this process for you. Once you receive the replacement headset and tubing, you will remove your chestpiece by pulling it firmly from the end of the damaged tubing. Then, reinsert the chestpiece into the end of the new tubing. Click here to watch a video demonstrating this process.

Your Pulse Time clock requires a LR-41 battery, available at any local drugstore or jewelry/watch store. Click here to watch a video of replacing the clock battery.

Free-Parts-For-Life Program

Yes, our Free-Parts-For-Life Program is really free. You only pay shipping charge.

Free-Parts-For-Life shipments will be sent to the shipping address on the original order or location of purchase. If you have moved to another country other than the original shipping location, please read our guidelines here.

Simply register if you haven't already, and make the request online at online registration and service form or call us at 1300 770 921 and we'll get you taken care of.

The parts include our ComfortSeal® Eartips in three sizes (small, medium and large), ID Tag, diaphragms, retaining rings and non-chill rings.

Our Free-Parts-For-Life Program shipments to Australia are held in bulk at our Australian office. Free parts will be shipped within 2-5 days of request. When you receive them will depend on the courier time frames which are out of our control.

Free-Parts-For-Life Program shipments do not include tracking information. After making your parts request online, you will receive a confirmation message and your parts will be shipped in 2-5 business days from placing the request.

Take your new retaining ring with the diaphragm installed and with the MDF Instruments logo facing up, place it on top of the diaphragm side of the chestpiece. Using your thumbs, slowly work around the edge of the ring to push it down and over the edge of the chespiece to fit snug. You may hear it snap into place. Inspect the chestpiece to make sure the diaphragm does not have any gaps or isn't popping out from the edge of the retaining ring. Feel free to watch this video showing the process.

Remove your existing retaining ring and diaphragm by pressing the retaining ring down towards the chestpiece with your thumbs until it pops off. This video demonstrates the process.

Take your replacement non-chill ring and start by fitting the edge of the ring around the bell of the stethoscope. Using your thumbs, work around the ring to stretch it over and down the bell. Check out this video showing the process.

To remove the non-chill ring, push the edge of the ring over and down the bell of the chestpiece. The entire ring should stretch over and off the bell. Click here to watch a video that will walk you through the process.


You can check with your local jeweler who offers engraving. Engraving the stethoscope chestpiece will not effect the sound quality or the Lifetime Warranty if engraved properly.

We recommend using 70% isopropyl alcohol pads or on a cotton ball or swab, to clean the eartips and wipe the diaphragm and chestpiece of your stethoscope. To clean the tubing, use warm water with mild detergent and a clean rag or towel to wipe the stethoscope tubing and dry. Do not soak the chestpiece or allow liquid to enter.

Due to the nature of the material of stethoscope tubing, it can easily pick up dyes from scrubs or pen ink and become stained. If you have tried cleaning the tubing and your stethoscope has become permanently stained, please feel free to contact us and we will try to find a solution that meets your needs.

All MDF Instruments Stethoscopes (excluding the single-use line) come with a Lifetime Warranty and Free-Parts-For-Life Program. If you are experiencing issues with your stethoscope or would like to order new parts, please contact us or register and submit your request online here.

Do not worry because we are happy to send you more at no cost, as part of our Free-Parts-For-Life Program. We offer replacement eartips in clear and black in three sizes (small, medium and large).

There are a few things you can check if you can't hear our of your stethoscope. First, check that the diaphragm is securely attached to the chestpiece with no gaps between the retaining ring and forms a tight seal like a drum. Make sure the chestpiece is rotated so that the green dot indicator on the stem if facing the side of the chestpiece you would like to use. Next, check that the pre-angled headset is facing forward so that the eartips are in line with the natural angle of your ear canals. Check if any part of the headset feels loose or broken inside of the tubing or if there are any punctures or tears in the tubing and it feels flexible and soft. If you are still not able to hear of your stethoscope, don't hesitate to contact us.

The green dot located on the stem of the chestpiece will indicate which side of the chestpiece is active. The stem will rotate to the diaphragm or bell side with the green dot indicating the open channel.

A dual head stethoscope will allow you to listen to both high and low sound frequencies. All MDF Instruments Stethoscopes will feature a True Bell and a True Diaphragm to consistent and easy auscultation. The bell side is designed to pick up low frequency sounds and the diaphragm side of the chestpiece is designed for high frequency.


If your sphygmomanometer is leaking air, it could be possible that the connections have loosened. Check the connection from the tubing to the gauge to make sure it is secure and the end of the tube is flush with the gauge. Also check the connection from the tubing to the bladder of the cuff to make sure it is secure and no air can escape. Next check the connection from the tubing to the bulb and make sure the end of tube sits flush with the metal end of the bulb.

Fully inflate the cuff and listen for a hissing sound. This could indicate an air leak. Check for punctures in the bladder, tubing and bulb. If you think you have an air leak, please contact us to place a Lifetime Warranty request. You may register your instrument and make the request online using our online registration and service form.

Check that the valve release on the gauge is working properly and will allow for a release of air when turned open. If this is still not working, please let us know by contacting us directly.

Using the wrong patient blood pressure cuff size will likely yield an incorrect blood pressure reading. All of our sphygmomanometers will come with an adult sized cuff, but we also offer the following cuff sizes separately, so you can ensure blood pressure reading accuracy.

Upper Arm Circumference Ranges by Cuff Size: Thigh: 40CM - 65CM (thigh or upper arm) Large Adult: 33.5CM - 50CM Adult: 25CM - 40CM Pediatric: 19CM - 27.5CM Infant: 14CM - 20CM Newborn: 10.2CM - 16CM

To clean your blood pressure cuff, remove the bladder, then wash with warm water and mild detergent. Allow to air dry before replacing the bladder. Bladders can be cleaned with a rubbing alcohol solution and clean cloth.

Reflex Hammers

Please contact us to see if you qualify for a Lifetime Warranty replacement. We would be happy to send you a new reflex hammer. You may complete the registration and Lifetime Warranty process online or contact us directly.

All of our reflex hammers have a Lifetime Warranty, so please contact us with a photo of your reflex hammer and let us know how this happened! You may also complete the Lifetime Warranty request and registration online.

You may qualify for a free replacement silicon mallet, included in our Lifetime Warranty. Please register your reflex hammer if you have not already and submit a Lifetime Warranty request, using our online registration and service form. Feel free to contact us for help with this process.


First verify that your penlight has working AAA batteries installed. If you replace the batteries and it's still not working or it has a defect not associated with the batteries, please contact us directly.

MDF penlights are warranted to be free from defects in material or craftsmanship. Penlights with defects in material or craftsmanship will be replaced or repaired without charge as long as the defect is reported within one year of the original purchase. The MDF® 621 LUMiNiX is warranted to be free from defects in material or craftsmanship. LUMiNiXes with defects in material or craftsmanship will be replaced or repaired without charge as long as the defect is reported within two years of the original purchase.

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