Practi-CRdM CPR Monitor


The NEW Practi-CRdM Compression Rate and Depth Monitor is designed to measure compression rate and depth when practicing CPR on a manikin. Worn on the students’ wrist, the CRdM will provide an audible “beep” when compression depth is not within the range of 5-6cm (2”-2.3”).  A diode illuminates red when compressions are below 100 cpm or above 120 cpm. When compression rate is between 100 and 120 cpm the diode illuminates green, allowing users to self-check their timing.


The flexible wristband fits any size wrist and may be used with any training manikin. The rechargeable lithium battery lasts a minimum of 3-4 hours and may be charged via USB port. Charging time is between 2-3 hours.


The Practi-CRdM provides an affordable solution that helps protect the investment training centers have in the manikins they own which do not offer compression rate and/or depth monitoring. These are key elements the AHA is requiring by the end of January, 2019 (see AHA Requirement Tab below).

Comes with a 1 year warranty.


Case pack: 20 Practi-CRdM’s w/ charging cables per case

Availability: In stock (Order Now)

SKU: WLCRdM Categories: ,
• Meets the January 2019 AHA mandate regarding the use of an “instrumented directive feedback device”
• Easy to use; little or no special training of instructors needed
• Works With Any Manikin!
• Measures BOTH compression rate and compression depth
• Adjustable wristband fits nearly any size wrist
• Economical
• A fraction of the cost of buying new manikins or retrofitting existing manikins
• Rechargeable lithium battery 3.7V and capacity of 90mAh via USB port  (USB charging cord included)
• 3-4  hours of continuous use on one battery charge
• One year warranty

WLCRdM – Practi-CRdM
Band: 10 x 0.75 inches
Protective Compact Case: 3 x3 x 1.75 inches
Weight: 0.1125 lbs

Case Dimensions: 17.5 x 7 x 5 inches | 2.25 lbs
20 Practi-CRdMs per case

Quoting from the AHA announcement relevent to the Practi-CRdM and how it meets these requirements:
  • The use of an “instrumented directive feedback device or manikin in all AHA courses that teach the skill of CPR.
  • The device at a minimum “must measure real-time audio feedback or visual feedback on compression rate and depth.”
  • The Practi-CRdM (WLCRdM) fulfills this requirement for visual feedback of compression rate as defined by the AHA: “Device with screen display that detects rate of actual compressions and indicates visually whether to push faster or to push slower in real time to meet AHA recommendations.”
  • The AHA also states that AHA devices “…can be added to and used with existing manikins.”

Q:  Can the Practi-CRdM be used to measure compressions on an infant manikin?
A:  No.  The Practi-CRdM is for use with adult/child CPR manikins only.

Q:  How do I turn on my CRdM?
A:  Touch the face of the monitor and hold until the green light turns to red. If the light does not turn to red, then the unit needs to be charged.

Q:  What is the band made of?
A:  Latex Free silicone rubber

Q:  Can I clean my CRdM?
A:  Yes. We recommend simply wiping the product with an alcohol wipe. Because the wristband is made of silicone, using bleach products may be too harsh.

Q:  I’m doing compressions properly but the light won’t turn green?
A:  The Practi-CRdM is a precisely calibrated instructional aid. Instructors who have initially reported their CRdM not functioning by not measuring CR or depth properly often found it was indeed user error. Instructors whose common practice was to use a metronome found the CRdM to perform accurately.

The CRdM introduces the additional feature of depth measurement which of course could pose another layer of potential complexity. The CRdM is precisely calibrated via its programmed electronics. Popular manikins use a simplistic clicking device and there may be a discrepancy between the two. After consulting with trainers, there was a general consensus most manikins used in the field are not necessarily precise machines, but “estimators” in measuring a range of depth. Not to mention the varying degrees of how some manikins are taken care of, i.e. years of wear and tear that could cause variations in performance.  Some instructors may view the manikin as the precise measurement for which the CRdM is measured by. To the contrary,  the CRdM is the teaching aid that will communicate proper rate and depth.

To check the accuracy of the CRdM CR, you can google “metronome” and apply compressions at the set metronome rate.

Q:  Can I adjust the volume of the CRdM?
A:  No.  There is no volume control at this time. During testing, if the sound was too loud students would hear each other’s devices. It was very difficult finding the ideal volume to be loud enough to overcome the noise of the manikin yet not too loud as to distract nearby students. Your feedback is very helpful and much appreciated. We are looking into the possibility of a volume control for future revisions in order to satisfy a broader range of users. We are not sure if this is possible without having to raise the cost. Ultimately we may have to stick with a fixed volume and make it louder in hopes it will not be too distracting. Again finding the happy medium is difficult.

Q:  Can I leave my CRdM connected to the charger after it is fully charged?
A:  Yes and No. The CRdM has over-charge protection. Over-charge will not cause the CRdM to fail, but it is suggested that the charging cable should be taken off after the unit is fully charged.

Q:  Is the CRdM waterproof?
A:  No it is not waterproof.

Customer videos of the CRdM in use

You may also like…