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RX-DD Digital Durometer

Made in the USAThe Checkline RX-DD is a precision Digital Durometer that is ideal for laboratory use.

With a large direct drive LCD display and RS232 data ports for computer compatibility.
It comes with a locking feature to prevent accidental erasure of tolerances, automatic shutoff and low battery warning.
Accessories such as MTI and SPC type printers, audio attachments and software are available as an option.

Available Scales: A, B, C, D, DO, M, O, OO, OOO (Asker, ISO, DIN & JIS Scales also available, inquire)

Type M Durometers require test stand RX-OS-3 per ASTM D2240.

All RX-DD models are supplied with a NIST traceable calibration certificate.


  • Includes NIST-Traceable Calibration Certificate
  • High and Low buttons for setting tolerance limits
  • Solid state circuitry with LCD display
  • One year warranty
  • Holds Peak reading until reset
  • 0.1 Unit Resolution
  • Supplied in custom fit carrying case
  • Conforms to ASTM D-2240
  • Optional Removable Stainless Steel Barrel for Medical and Food Applications
  • Minimum Sample Thickness -Type A = 6 mm (1/4") -Type M = 1.25 mm (0.050")

Operating Principle

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RX-DD-MS Digital Multi-Scale Durometer Test Kit

  • Includes NIST-Traceable Calibration Certificate
  • For the technician that must perform hardness tests on various types of non-metallic materials

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RX-SWC -2 Durometer Software

  • Provides a running log of all measurements along with a chart of the data as well as statistical information
  • Includes USB-Cable

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RX-TBK-A Type A Durometer Test Block Kit

  • Enables the user to perform a quick check for proper durometer operation

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RX-BF 'Big Foot' Durometer Foot Adapter

  • The Big Foot increases the diameter of the foot from 1/2" to 1 3/8" diameter

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RX-CLW Constant Load Weight for Types A, B, O, OO & OOO

  • The Constant Load Weight for gauges with an 822g springload (types A, B, O) slides onto the lower barrel of the gauge, gives it a wider foot, and raises the mass of the gauge to the suggested 1kg

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Cic-Duro Durometer Calibration

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  • Possibility to adjust and repair

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RX-DIN-FA ASTM to DIN 53505 Adapter for RX durometers

  • Special attachment gives you two gauges in one model.
    With attached, the gauge confirms to DIN 55305 norm.
    When taken off, the gauge is conform ASTM D2240.

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EMS4 Remote Readout Data Collection Application

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  • Simultaneous Connection of Up to 4 Devices (Durometer, Indicator, Caliper, Micrometer)
  • 7" Color Tablet
  • Mux Box

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RX-1000 Mini-Dial Durometer

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Durometer Test Stands

durometer test stands We offer a complete line of durometer test stands. The stand, when used in conjunction with a Durometer, eliminates operator error sometimes associated with hand-held durometer testing. Our stands feature a load weight for the proper testing pressure as noted in ASTM D2240, and a quick-lock column for easy adjustment. Click here for more info on Durometer Test Stands.

Available Models



Indentor Shape Force

Flat cone point, 35º Included Angle
Soft rubber, plastics, and elastomers, printer's rolls.
822 Gr

Sharp cone point, 30º Included Angle
Harder elastomers and plastics. Paper and fibrous materials, Use above 93 Duro A.
822 Gr

Flat cone point, 35º Included Angle
Medium hard elastomers and plastics. Also useful to avoid surface marks.
4536 Gr

Sharp cone point, 30º Included Angle
Hard rubber and plastics such as thermo plastics, flooring and bowling balls.
4536 Gr

3/32" Spherical
Dense granular material, textile windings.
4536 Gr

3/32" Spherical
Very soft elastomers, textile windings, soft granular materials. Use below 20 Duro A.
822 Gr

3/32" Spherical
Light foams, sponge rubber gels, animal tissue.
113 Gr

1/2" Spherical
Ultra soft gels and sponge rubber.
113 Gr

Sharp cone point, 30º Included Angle
Materials as thin as .050"




Comparison Table
A 10 20 30 40 50 60 70 80 90 100
B 10 20 30 40 50 6 0 70 80 90 100
C 10 20 30 40 50 60 70 80 90 100
D 10 20 30 40 50 60 70 80 90 100
DO 10 20 30 40 50 60 70 80 90 100
O 10 20 30 40 50 60 70 80 90 100
OO 10 20 30 40 50 60 70 80 90 100
OOO Not inside scale
M 30 40 50 60 70 80 90

This chart is for comparison purposes only.
It cannot be used for conversion reference.


Slim Probe Durometers

We offer custom slim probe versions of most durometer models and types. The slim probe attachment can be modified to fit your specific needs or applications.


Click here for more information

Complete Kit

The RX-DD is supplied as a complete kit including

  • RX-DD durometer
  • Calibration Certificate
  • Instruction manual
  • in a foam-fitted metal carrying case.


Dimensions Durometers RX-DD


2.25" x 6.125"
Weight, net:
202 grams
Power Supply:
(2) 3V CR-2450 batteries
AC Adapter optional
0.1 units
1 year

Buy Now


Product name
RX-DD-A Type A Digital Durometer
€ 954,00 
RX-DD-B Type B Digital Durometer
€ 1.026,00 
RX-DD-C Type C Digital Durometer
€ 1.026,00 
RX-DD-D Type D Digital Durometer
€ 954,00 
RX-DD-DO Type DO Digital Durometer
€ 1.026,00 
RX-DD-O Type O Digital Durometer
€ 1.026,00 
RX-DD-OO Type OO Digital Durometer
€ 1.026,00 
RX-DD-OOO-E - RX-DD-OOO Type OOO Digital Durometer
€ 1.499,00 
RX-DD-M Type M Digital Durometer
€ 1.499,00 
RX-DD-AM Digital Durometer AM ISO 7619
€ 1.899,00 


Product name
RX-ADAPTER - 220VAC Power Adapter for RX-DD-Series (600mA)
€ 25,00 
RX-DIN-FA - ASTM to DIN 53505 foot adapter
€ 136,00 
RX-G03-0018 - RS-232 Data Output Cable
€ 116,00 
RX-G13-0055 - USB Data Output Cable (Transfers data via a Wedge or Data Collection program)
€ 161,00 
EMS4 Remote Readout Data Collection Application
€ 1.201,00 
All mentioned prices are excluding VAT & excluding shipment costs.
Availability: Available , preorder 1-2 weeks , special order, request
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