Portable hardness testers
Measures hardness of metals on the following scales:
Rockwell «C» 20..70 HRC
Measurement accuracy: ±2 HRC
Brinell 75..650 HBW
Measurement accuracy: ±12 HB
Vickers 75..999 HV
Measurement accuracy: ±15 HV
Included in the State Register of Measuring Instruments
- Verification valid for 1 year
- Delivered after verification or calibration
Factory calibration on 1st grade test blocks
Down
Ultrasonic probe
Ultrasonic probe
- Thin parts down to 1 mm
- Absence of impactors – increased reliability
- Unparalleled ratio between applied load and allowed roughness
Load for different surface quality
*
**
***
U10
=
1 kgf
=
1,6 Ra
U15
=
1,5 kgf
=
2,5 Ra
U50
=
5 kgf
=
4,5 Ra
U100
=
10 kgf
=
8 Ra
*
Type of probe **
Thoriated load ***
Max. allowed roughness 
Dynamic probe
Dynamic probe
- Quickest of all methods
- Massive parts
- Most popular portable method (definitely used at a nearby factory)
Electronic module
1. BINDER connectors (Germany)
- Proven German quality
2. LCD screen
- Clear display of results
- User friendly interface
3. Keyboard
- Simple and intuitive control
- Durability
4. Electronic module
- Conversion between hardness scales
- Calculation of mean value from a series of measurements
- Archive of measurements
5. Cast aluminum body
- Aluminum dustproof and water-resistant body IP65 (Germany)
Electronic module
How we calibrate our hardness testers
Advantages of calibration
Measurement accuracy
≈2.3
HRC
Hardness tester measurement accuracy (2.0 HRC)
+
Measurement accuracy of 1st grade hardness test block (0.3 HRC)
+
Measurement accuracy of 1st grade hardness test block (0.3 HRC)
- To perform calibration, we use 1st grade hardness reference test blocks from primary calibration machine
- Minimum measurement error thanks to direct calibration bypassing other stages of verification scheme
- Each hardness scale is calibrated against its reference test blocks: for HRC we use hardness test blocks corresponding to HRC scale, for HB we use those corresponding to HB scale, etc.
Calibration of similar hardness testers
Measurement accuracy
≈3.1
HRC
Hardness tester measurement accuracy (2.0 HRC)
+
Measurement accuracy at other stages of verification scheme on 2nd grade hardness test block (1.1 HRC)
+
Measurement accuracy at other stages of verification scheme on 2nd grade hardness test block (1.1 HRC)
- Use less homogeneous 2nd grade hardness test blocks
- 2nd grade hardness test blocks already contain the sum of errors by calibration machine and 1st grade hardness test blocks
- Use hardness conversion tables during calibration, which gives additional error. Such tables are not standardized in Russia since they are inaccurate
Complete set
1. Ultrasonic probe U15
2. Dynamic probe D
3. Electronic module
4. Cable for connecting ultrasonic probe to electronic module
5. Cable for connecting dynamic probe to electronic module
6. USB cable for charging and connecting to PC
7. Power unit for charging
8. Headpiece for spherical parts
9. Headpiece for cylindrical parts
Complete set
Compare
Portable hardness testers
MET-D1A
MET-U1A
MET-UDA
Ultrasonic probe
no
yes
yes
Dynamic probe
yes
no
yes
Body type
Aluminum IP 67
Time of one hardness measurement, s
0,5
2
0,5
Minimum sample weight, kg
3
0,01
0,01
Minimum sample thickness, mm
10
1
1
Transfer of archive data to PC
yes
yes
yes
Warranty
1 year
Hardness measurement on cylindrical and spherical surfaces
yes
yes
yes
Maximum allowed roughness
3.2 Ra
3.2 Ra
4.5 Ra (probe U50)
8.0 Ra (probe U100)*
2.5 Ra (probe U15)
4.5 Ra (probe U50)
8.0 Ra (probe U100)*
Use of support*
no
yes
yes
Measurement accuracy, HRC
±2
±2
±2
Measurement accuracy, HB
±10
±10
±10
Measurement accuracy, HV
±12
±12
±12
Indentation depth, µm
200
30
30; 200
