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Rockwell/Superficial Rockwell
Twin Hardness Tester

Model No. 900-375

Our latest Phase II analog Rockwell Hardness Tester, the 900-375,  tests both Rockwell hardness and Superficial Rockwell hardness in one unit, with state of the art design and dynamic precision only found at Phase II. The Phase II Twin Rockwell/Superficial Rockwell hardness tester is ruggedly engineered to obtain highly sensitive and accurate readings. Conforming to ASTM E-18 Rockwell hardness standards, this hardness tester will offer unmatched repeatability in all Rockwell hardness scales. A perfect performer suited for any environment including heat treatment facilities, tool rooms, workshops, laboratories and inspection labs. Lifetime technical support is included with all Phase II Hardness Testers. So test away with confidence and a level of accuracy you will only find at Phase II.

Features: Model No. 900-375

  • Direct analog dial reading
  • Advanced design, easy to operate
  • Engineered to obtain highly sensitive and accurate readings
  • Conforms to ASTM E-18

pht-1740 pht-1740
Perfect for laboratories, workshops, tool rooms, inspection labs, etc.
Minor Load 3 Kgf,            10 Kgf
Major Load 15Kgf            60 Kgf
30 Kgf          100 Kgf
45 Kgf          150 Kgf
Test Force Application Dead Weight
Test Force Control Manual
Results Display Dual Scale Dial
Vertical Capacity 6.0 in.
Throat Depth 5.5 in.
Height 26.0 in.
Width 18.2 in.
Depth 9.4 in.
Shipping Weight 250 lbs
Hardness Scales: HRA B,C,D,E,F,G,H,K , L, M (superficial)  HR15N, HR15T, HR30N, HR30T, HR45N, HR45T


  • Diamond Conical Indentor
  • 1/16” Ball Indentor
  • 2- HRC Test Blocks
  • 1- HRB Test Block
  • 1- HR15N Test Block
  • 1- HR30N Test Block
  • 1- HR45T Test Block
  • Test Table 5.87” (150mm)
  • Flat Anvil 2.5” (63mm)
  • Std. Vee Anvil
  • Accessory Case
  • Dust Cover


Hardness Tester Accessories Portable Hardness Testers
Hardness Tester Block Certification Minimum Thickness Chart for Rockwell Hardness Testing
Rebuilt Inventory with Full Warranty Rockwell Hardness Scale Indentor Load Chart
Hardness Tester Conversion Chart Hardness Setup:
  • 900-331
  • Principle of Rockwell Hardness Testing NIST Links
    Roundness Correction Chart for Hardness Testing ASTM Links