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21 Industrial Ave.
Upper Saddle River, NJ 07458
Phone: 201-962-7373
Toll Free: 800-526-9087
Fax: 201-962-8353

Rockwell/Superficial Rockwell
Twin Hardness Tester
warranty  nist

Model No. 900-375

Test Rockwell and Superficial Rockwell Hardness in 1 Unit!

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

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


Results Display

Dual Scale Dial

Vertical Capacity

6.0 in.

Throat Depth

5.5 in.


26.0 in.


18.2 in.


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


Scale Symbol Indentor Type Preliminary Force N (kgf) Total Force N(kgf) Typical Applications
A Spheroconical Diamond 98.07 (10) 588.4 (60) Cemented carbides, thin steel, and shallow case hardened steel
B 1/16” Carbide Ball 98.07 (10) 980.7 (100) Copper alloys, soft steels, aluminum alloys, malleable iron, etc.
C Spheroconical Diamond 98.07 (10) 1471 (150) Steel, hard cast irons, pearlitic malleable iron, titanium, deep case hardened steel, other harder than HRB 100
D Spheroconical Diamond 98.07 (10) 980.7 (100) Thin steel and medium case hardened steel, and pearlitic malleable iron
E 1/8” Carbide Ball 98.07 (10) 980.7 (100) Cast Iron, Aluminum and magnesium alloys, and bearing metals
F 1/16” Carbide Ball 98.07 (10) 588.4 (60) Annealed copper alloys and thin soft sheet metals
G 1/16” Carbide Ball 98.07 (10) 1471 (150) Malleable irons, copper-nickel-zinc and cupro-nickel alloys
H 1/8” Carbide Ball 98.07 (10) 588.4 (60) Aluminum, zinc and lead
K 1/8” Carbide Ball 98.07 (10) 1471 (150)  
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Hardness Testers
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Phase II Plus
21 Industrial Ave.
Upper Saddle River, NJ 07458
Phone: 201-962-7373
Toll Free: 800-526-9087
Fax: 201-962-8353
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