Hardness Testers and Durometers

Durometer Testers
Durometer Test Stands
Durometer Accessories

F.A.Q.

What is the difference between Shore A, Shore D, and Shore OO durometer scales?

 All three scales comply with ASTM D2240 but use different spring forces and indenter tip geometries to match material stiffness:
  • Shore OO uses a very light spring force (113 gf) and a spherical Ø 2.4 mm tip for ultra-soft foams, sponges, and gels.
  • Shore A uses an 822 gf spring load and a blunt 35° frustum cone for normal soft-to-medium rubbers, elastomers, and soft PVC.
  • Shore D uses a heavy 4,536 gf (10 lb) spring load and a sharp 30° cone for hard rubbers (above 90 Shore A) and rigid thermoplastics. When a specimen reads above 90 on the Shore A scale, ASTM D2240 recommends switching to a Shore D durometer; when a Shore D reading falls below 20, switch to Shore A.

Why should I choose an IRHD or Type M tester instead of Shore A for O-rings and thin sheets?

 Standard Shore A durometers require a minimum flat specimen thickness of 6 mm (0.24"); on thinner sheets or curved O-rings, the indenter force penetrates through the rubber and senses the hard support table underneath, producing artificially high readings. IRHD Micro Hardness Testers (per ASTM D1415 / ISO 48) and Type M O-Ring Systems (like the Rex OTK-DG paired with the Rex OS-3 Stand) use micro indenters and low forces specifically designed to test materials from 0.030" (0.76 mm) to 5 mm and curved O-ring cross-sections without destructive cutting.

Why is a durometer test stand recommended for ASTM D2240 compliance?

 Hand-held durometer readings vary between operators due to differences in pressing force, approach speed, and angular tilt. Mounting your durometer on a constant-load or motorized stand from our Durometer Test Stands subcategory—such as the Imada YMS Motorized Stand, Imada SY Lever Stand, or Rex OS-2H Hydraulic Dampened Stand—applies the exact ASTM D2240 mass (1 kg for Type A/B/E/O, 5 kg for Type C/D/DO, or 400 g for Type OO/OOO) at a controlled descent rate and strictly perpendicular contact angle.

How do I verify durometer accuracy in the field or laboratory?

 Per ASTM D2240, durometers should be checked regularly against certified reference blocks to verify spring calibration and indenter condition. ABQ Industrial supplies Rex Durometer Test Block Kits (TBKC Series) with NIST-traceable certificates, Checkline TBK-HP / HP-PT Test Blocks, Hildebrand IRHD Test Block Sets, and the Rex RDC-1 Durometer Calibrator for full in-house spring-force calibration.

Rex Durometer Testers


Rex RX-1600-A120 Skateboard Wheel Durometer

$765.00
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Rex RX-1600-A120 Skateboard Wheel Durometer
Rex RX-1600-A120 Skateboard Wheel Durometer
  • Rex RX-1600-A120 Skateboard Wheel Durometer
  • Specially designed for the skate community
  • Manufacturer: Checkline
  • Warranty: One Year
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Rex 4000 Max Hand Durometer RX-4000

$1,518.00
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Rex 4000 Max Hand Durometer RX-4000
Rex 4000 Max Hand Durometer RX-4000
  • Available Scales: A, D
  • Rex 4000 Max Hand Durometer RX-4000
  • Holds Reading Until Reset
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Rex 1600 Dial Shore Durometer RX-1600

$528.00 - $913.00
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Rex 1600 Dial Shore Durometer RX-1600
Rex 1600 Dial Shore Durometer RX-1600
  • Rex 1600 Dial Shore Durometer RX-1600
  • Available Scales: A, AO, B, CF, D, E, DO, M, O, OO, OOO, OOO-S (Asker, ISO, DIN & JIS Scales also available, inquire)
  • Conforms to ASTM D-2240
  • Includes NIST Calibration Certificate
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Rex 2000 Max-Hand Shore Durometer RX-2000

$693.00 - $754.00
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Rex 2000 Max-Hand Shore Durometer RX-2000
Rex 2000 Max-Hand Shore Durometer RX-2000
  • Rex 2000 Max-Hand Shore Durometer RX-2000
  • Available Types:
    A, D, B, C, DO, E, and O
  • Conforms to ASTM D-2240
  • Includes NIST Calibration Certificate
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Rex DD-4 Precision Digital Shore Durometer RX-DD

$1,260.00 - $1,700.00
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Rex DD-4 Precision Digital Shore Durometer RX-DD
Rex DD-4 Precision Digital Shore Durometer RX-DD
  • Rex DD-4 Precision Digital Shore Durometer RX-DD
  • Available Scales: A, AO, B, C, D, DO, E, M, O, OO, OOO (Asker, ISO, DIN & JIS Scales also available, inquire)
  • Conforms to ASTM D-2240
  • Includes NIST Calibration Certificate
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Rex RX-DD-5 Digital Durometer with Adjustable Timer

$1,650.00 - $1,980.00
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Rex RX-DD-5 Digital Durometer with Adjustable Timer
Rex RX-DD-5 Digital Durometer with Adjustable Timer
  • Adjustable Measurement Timer with Onscreen Countdown
  • Available Scales: A, D
  • Store and View up to 200 Measurements
  • Includes NIST Calibration Certificate
  • Conforms to ASTM D-2240
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Rex 3000 Max Hand Durometer RX-3000

$748.00
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Rex 3000 Max Hand Durometer RX-3000
Rex 3000 Max Hand Durometer RX-3000
  • Rex 3000 Max Hand Durometer RX-3000 with 18mm Diameter Presser Foot
  • Available Scales: A, D
  • 18mm Diameter Presser Foot
  • Holds Reading Until Reset
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Rex QC Pocket Shore Durometer

$314.00
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Rex QC Pocket Shore Durometer
Rex QC Pocket Shore Durometer
  • Rex QC Pocket Shore Durometer / Hardness Tester
  • Available Scales: A and D
  • Virtually Unbreakable
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Rex 2100-A Tire Durometer / Hardness Meter RX-2100

$550.00
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Rex 2100-A Tire Durometer / Hardness Meter RX-2100
Rex 2100-A Tire Durometer / Hardness Meter RX-2100
  • Rex 2100-A Tire Durometer / Hardness Meter RX-2100
  • Calibrated to the ASTM D-2240 standard for durometer hardness
  • Quickly and accurately checks tire hardness
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Rex H-1000 Mini-Dial Shore Durometer RX-1000

$528.00 - $913.00
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Rex H-1000 Mini-Dial Shore Durometer RX-1000
Rex H-1000 Mini-Dial Shore Durometer RX-1000
  • Rex H-1000 Mini-Dial Shore Durometer RX-1000
  • Available Scales: A, B, C, D, DO, O and Asker C
  • Conforms to ASTM D-2240
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Rex RX-MS Multi-Scale Dial Shore Durometer

$1,524.00 - $4,345.00
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Rex RX-MS Multi-Scale Dial Shore Durometer
Rex RX-MS Multi-Scale Dial Shore Durometer
  • Rex RX-MS Multi-Scale Dial Shore Durometer
  • Available Scales: A, B, C, D, DO, O, OO, OOO
  • Conforms to ASTM D-2240
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Rex RX-DD-MS Digital Multi-Scale Shore Durometer

$2,629.00 - $6,083.00
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Rex RX-DD-MS Digital Multi-Scale Shore Durometer
Rex RX-DD-MS Digital Multi-Scale Shore Durometer
  • Rex RX-DD-MS Digital Multi-Scale Shore Durometer
  • Available Scales: A, B, C, D, DO, O, OO, OOO 
  • Conforms to ASTM D-2240
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Rex Durometer Test Stands


Rex EMS4 Remote Readout Data Collection App

$1,436.00
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Rex EMS4 Remote Readout Data Collection App
Rex EMS4 Remote Readout Data Collection App
  • Rex EMS4 Remote Readout Data Collection App
  • 7" Color Tablet with Remote Android App 
  • Custom Made Tablet Stand
  • AC Adapter
  • Set Tolerances
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Rex OS-1 Durometer Test Stand

$1,794.00
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Rex OS-1 Durometer Test Stand
Rex OS-1 Durometer Test Stand
  • Rex OS-1 Durometer Test Stand
  • Durometer Operating Stand for use with type A, B, C, D, DO, E, O, OO, and OOO
  • Compatible with RX-1600, RX-1700 & RX-DD Durometers
  • Manufacturer: Rex
  • Warranty: One Year
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Rex OS-2 Durometer Test Stand

$1,116.00 - $1,506.00
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Rex OS-2 Durometer Test Stand
Rex OS-2 Durometer Test Stand
  • Rex OS-2 Durometer Test Stand for Type A, B, E and O scale durometers
  • Eliminates operator error
  • Manufacturer: Rex
  • Warranty: One Year
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Rex OS-3 Durometer Test Stand for Type M Durometer

$1,506.00
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Rex OS-3 Durometer Test Stand for Type M Durometer
Rex OS-3 Durometer Test Stand for Type M Durometer
  • Rex OS-3 Durometer Test Stand for Type M Durometer
  • Required for Type M Durometers per ASTM D2240
  • Manufacturer: Rex
  • Warranty: One Year
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Rex OS-4 Durometer Test Stand for Type OO & OOO

$1,116.00 - $1,506.00
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Rex OS-4 Durometer Test Stand for Type OO & OOO
Rex OS-4 Durometer Test Stand for Type OO & OOO
  • Rex OS-4 Durometer Test Stand for Type OO & OOO
  • Eliminates operator error
  • Manufacturer: Rex
  • Warranty: One Year
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Rex OS-AUTO Motorized Durometer Test Stand

$5,430.00
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Rex OS-AUTO Motorized Durometer Test Stand
Rex OS-AUTO Motorized Durometer Test Stand
  • Rex OS-AUTO Motorized Durometer Test Stand
  • Manufacturer: Checkline
  • Warranty: One Year
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Rex Durometer Accessories


Rex RDC-1 Durometer Calibrator

$7,645.00
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Rex RDC-1 Durometer Calibrator
Rex RDC-1 Durometer Calibrator
  • Rex RDC-1 Durometer Calibrator
  • Allows users to accurately calibrate durometers in-house
  • Manufacturer: Rex
  • Warranty: One Year
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Rex Durometer Test Block Kits

$246.00 - $360.00
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Rex Durometer Test Block Kits
Rex Durometer Test Block Kits
  • Rex Durometer Test Block Kits with NIST Traceable Certificates of Conformance
  • Enables user to perform a quick check for proper durometer operation
  • Manufacturer: Rex
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Rex ORF-1 O-Ring Fixturing Set

$456.00
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Rex ORF-1 O-Ring Fixturing Set
Rex ORF-1 O-Ring Fixturing Set
  • Rex ORF-1 O-Ring Fixturing Set
  • Allows operator to check for proper durometer operation
  • Measures O-Rings 1/16" to 1/4"
  • Manufacturer: Rex
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Rex V-Block Cube

$138.00 - $220.00
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Rex V-Block Cube
Rex V-Block Cube
  • Rex V-Block & Base plate for O-rings and small samples
  • Allows precise, repeatable measurement of small samples
  • Manufacturer: Rex
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Rex CLW Constant Load Weight RX-CLW

$144.00 - $300.00
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Rex CLW Constant Load Weight RX-CLW
Rex CLW Constant Load Weight RX-CLW
  • Rex CLW Constant Load Weight RX-CLW
  • The Constant Load Weight for gauges with an 822g springload (types A, B, 0) slides onto the lower barrel of the gauge, gives it a wider foot, and raises the mass of the gauge to the suggested 1kg
  • Manufacturer: Rex
  • Warranty: One Year
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Rex RX-BF Big Foot Durometer Foot Adapter

$144.00
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Rex RX-BF Big Foot Durometer Foot Adapter
Rex RX-BF Big Foot Durometer Foot Adapter
  • The Big Foot increases the diameter of the foot from 1/2" to 1 3/8" diameter
  • Manufacturer: Rex
  • Warranty: One Year
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Rex DIN-FA 18mm Durometer Foot Attachment DIN - ASTM Type R

$132.00
About this item
Rex DIN-FA 18mm Durometer Foot Attachment DIN - ASTM Type R
Rex DIN-FA 18mm Durometer Foot Attachment DIN - ASTM Type R
  • Rex 18mm Durometer Foot Attachment DIN / ASTM Type R
  • Manufacturer: Checkline
  • Warranty: One Year
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Rex SWC-1 RX Lab Durometer Software

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Rex SWC-1 RX Lab Durometer Software
Rex SWC-1 RX Lab Durometer Software
  • Rex SWC-1 RX Lab Durometer Software
  • Provides a running log of all measurements along with a chart of the data as well as statistical information
  • Manufacturer: Rex
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