Quantum IV – Body Composition Analyzer

  1. Description
  2. Documents
  3. Purchase
  4. FAQ


Product Overview – The Quantum IV is our flagship product and represents a culmination of more than 30 years of technology and continuous improvement. It is lightweight, easy to use, and fully portable. The instrument case has been designed to withstand almost any environment, ensuring the accuracy and reliability of your Quantum IV data.

Key Features – The Quantum IV features a bright green OLED display that is easy to read and provides all the pertinent information on one screen in your choice of English, Spanish, Italian, or German. Not only does this simplify the testing procedure, but it allows the entire test to be conducted very quickly.

Another key feature of the Quantum IV is its ability to run for more than nine hours continuously, before needing a recharge of its internal lithium ion batteries, so you can be assured that your Quantum IV is always ready to go.  Adding to the legendary quality of the RJL Quantum BIA, this robust feature set also includes an ergonomically designed case, ensuring years of reliable service even in the harshest environments.

BC Software – MAC and PC Body Composition software is included with the purchase of your Quantum IV. Resistance and Reactance data from the instrument can be automatically retrieved using the USB cable (while connected to a human subject), or manually entered.

For more information on segmental BIA: Eight Electrode Segmental BIA – PDF

Documents that Apply to All Analyzers: Documents for the Quantum-IV: Documents that Apply to All Software:


(Analyzer prices include software, subject cables, and an initial supply of electrodes)
Item# Name  
Q4 Quantum-IV $2,490.00 With Standard 3-year Warranty
Q4-PLUS Quantum-IV-PLUS $3,590.00 See what's included.

Take advantage of our Referral Program.
You can also get a discount on a new analyzer by trading in your old one.*
* Conditions apply


Item# Description Price  
BC4 BC (Body Composition)
BC4 Extra Seat Allow your software license code to be used on an additional computer. $50.00

Purchase Additional Accessories & Supplies

Subject Cables

SC6PIN6 6-pin Subject Cables -- $75.00
(For all Quantum III, IV, and Quantum V analyzers, and Quantum-II and -X analyzers sold after May 1, 2009)

Other Accessories

Item# Description Price  
TEST Test Resistor


Purchase an Extended Warranty

RJL Systems includes a warranty with every instrument sold. To continue warranty coverage beyond the original warranty period, you will need to purchase an extended warranty. Extended warranties are only offered on models of analyzers in our current product line, and cannot be ordered for any discontinued analyzer.
Purchase an extended warranty for a Quantum-IV
Enter Serial Number:
Q4 -
years at $99.00/year


How will I know if my RJL analyzer is operating correctly (calibrated)?

A 500-ohm resistor is included with all the RJL analyzers. This resistor allows you to check the calibration of the analyzer. For an explanation on how to test the calibration of your unit, please refer to the manual.

Is there any chance of electrical shock while operating the RJL analyzers?

No, all of the RJL analyzers are designed with isolation transformers that prevent any harmful current from being exposed to the subject while being tested.

Will climate affect the BIA test?

Yes, but only when climate changes are extreme.

Is the RJL equipment FDA approved?

The Food and Drug Administration regulates all BIA devices as class II medical devices. Manufacturers must receive clearance from the FDA to market a class II device. Please visit the FDA website for more information on RJL registration and clearances. ( FDA Website – search for RJL Systems under Applicant Name or Owner Name.)

What is the life expectancy of an RJL analyzer?

So long as you take care of your analyzer, it can last a long time. RJL has many of their customers (from as far back as 1980) using their originally purchased analyzers.

Are the RJL analyzers very difficult to operate?

No, anyone can operate the RJL analyzers. It is helpful, however, to read the supplied manuals first.

In addition, anyone planning on using an analyzer in a clinical setting should practice applying the electrodes and collecting the resistance and reactance values to ensure that they are able to reliably and repeatably place the electrodes in the same spots on the skin every time.