Changzhou Nuoji Instrument Co., Ltd
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Portable Leeb hardness tester (high-precision type)
The MH210 portable Leeb hardness tester features a fully sealed metal casing that is compact, portable, and highly reliable. It is suitable for harsh
Product details

1、 Overview:
MH210 is an enhanced version of our HL200, which not only has all the functions of HL200, but also excels in measurement accuracy and measurement stability.
MH210 is an innovative improvement in the hardness measurement mechanism and circuit performance based on existing Leeb hardness measurement instrument products. Through technological and process innovation, as well as a factory aging treatment of no less than 72 hours, the product has higher accuracy, more stable measurement values, and stronger functionality. The unique advantage of MH210 lies in its ability to combine two data processing solutions: a portable all Chinese self powered thermal high-speed printer and user-friendly PC connected processing software. On site printing is convenient, fast, quiet, and flexible, meeting the on-site needs of different personalized users. Low power design, connected to computer for data exchange, massive storage. Low power design, no less than 100 hours of standby time, powered by AA size 5 ordinary battery, easy to carry, and more flexible to replace. Especially suitable for work sites and field operations.
twoCharacteristics:
1. Fully sealed metal casing, compact, portable, highly reliable, suitable for harsh operating environments, strong resistance to vibration, impact, and electromagnetic interference, sturdy and durable;
According to the principle of Leeb hardness measurement, various metal materials can be tested. The measurement range is wide, and there are no shape restrictions on the measured workpiece. It supports 360 degree measurement direction and has a software calibration function for startup indication, which can ensure that the data is applicable and accurate under different specifications and standards in any industry.
3. Supports multiple hardness tester systems including Rockwell (HL), Brinell (HB), Rockwell B (HRB), Rockwell C (HRC), Rockwell A (HRA), Vickers (HV), and Shore (HS). Parallel conversion between hardness and hardness can be performed before and after measurement.
4. Excellent compatibility performance, seven types of impact devices do not require calibration and automatic recognition. The price of the special-shaped impact device and series of special-shaped support rings is reasonable, meeting the maximum needs of different customers and fields.
5. Full Chinese large screen 128 * 84 graphic dot matrix LCD display with EL backlight support, convenient for use in low light environments.
6. The host panel features a fully Chinese menu style operation, and the circuit design embodies a humanized concept. With just one click, the material and hardness can be switched freely, making it simple and convenient.
7. Equipped with a commonly used 232 plug and play interface, the standard configuration includes PC data processing software for connecting to a computer and a miniature on-site high-speed thermal printing device. Convenient and flexible real-time processing of on-site data.
8. Large capacity storage of up to 500 sets of hardness measurement data (impact frequency 32-1), each set of data including single measurement value, average value, measurement date, impact direction, frequency, material, hardness system, and other information. Using software to connect to a computer can also achieve massive storage.
9. The upper and lower limits of the hardness value can be pre-set, and an automatic alarm will be triggered if it exceeds the range, making it convenient for users to conduct batch testing.
10. Support "Steel" materials. When testing "Steel" specimens with a D/DC impact device, the HB value can be directly read without the need for manual table lookup.
11. It has energy-saving functions such as automatic sleep and automatic shutdown, low-power design, powered by 2 AA No. 5 batteries for easy replacement, and stronger battery reliability.
12. Two years of free warranty, with qualified prices for vulnerable and consumable parts.
13. Dimensions: 132 X 76.2
14. Whole machine weight: 345g
3、 Applicable materials:
Steel and cast steel, alloy tool steel, stainless steel, gray cast iron, ductile iron, cast aluminum alloy, copper zinc alloy (brass), copper tin alloy (bronze), pure copper, forged steel
4、 Main application areas:
Mold cavity.
Bearings and other components.
Failure analysis of pressure vessels, steam turbine generators and their equipment.
Heavy duty workpieces.
Installed mechanical or * assembly components.
Workpieces with limited experimental space.
Require formal original records of test results.
Classification of materials in metal material warehouses.
Rapid inspection of multiple measurement points on a large scale of large workpieces.
5、 Technical parameters:
Measurement range:
(170-960)HLD,(17-68.5)HRC,(19-651)HB,(80-976)HV,(30-100)HS,(59-85)HRA,(13-100)HRB
Measurement direction: Supports 360 º (vertical downward, oblique downward, horizontal, oblique upward, vertical upward)
Hardness standards: Leeb (HL), Brinell (HB), Rockwell B (HRB), Rockwell C (HRC), Rockwell A (HRA), Vickers (HV), Shore (HS)
Display: Dot matrix LCD, 128 × 64 graphic dot matrix LCD
Data storage: up to 500 sets (with 32 to 1 impact times)
Operating voltage: 3V (2 AA sized alkaline batteries connected in series)
Continuous working time: about 50 hours (without backlight)
Communication interface standard: RS232
6、 Working conditions:
Environmental temperature: Operating temperature -20 to+60 ℃; Storage temperature:- 30℃~+60℃
Relative humidity ≤ 90%;
There is no strong vibration, strong magnetic field, corrosive medium, or severe dust in the surrounding environment.
7、 Power on display and brief explanation:
After booting up, it will automatically enter the main display interface, as shown in the following figure:

%Battery level: Display remaining battery level.
%Impact direction: Current impact direction.
%Average value: appears when the average value is displayed after reaching the set number of impacts.
%Hardness system: The hardness system of the current measured value.
%Measurement value: Current single measurement value (no average prompt), current average value (with average prompt).
%Display indicates exceeding the conversion or measurement range, indicating below the conversion or measurement range.
%Material: The currently set material.
%Impact frequency: Display the completed impact frequency during measurement, display the set impact frequency when setting the impact frequency with the frequency shortcut key, and display the corresponding number of times for a single measurement value when browsing.
8、 Data processing software:
Storage: Store the measured data
Call out: call out data from the host
Printing: Print and output data, A4 interface
Over limit: Display of over limit after setting tolerance limit
Clear: Clear measurement data
Connection: Set up connection with the host
Disconnect: Set to disconnect from the host
Download: Download data locally to achieve massive storage
Settings: Parameter Settings
Help: Instant Help Function
8、 Standard configuration:

Serial Number
name
quantity
1
host
1 unit
2
Standard Leeb hardness block
1 piece
3
D-type impact device
1 piece
4
Nylon brush A
1 piece
5
Small support ring
1 piece
6
AA (size 5) alkaline battery
4 sections
7
Data transmission processing software
1 set
8
data communication cable
1 item
9
Printing communication cables
1 item
10
Micro printer
1 piece
11
Mini printer charger
1 piece
12
Delivery Attached Documentation
1 copy
13
ABS instrument box
1 piece
14
Battery compartment tool
1 piece
15
Host strap
1 item
9、 Optional configuration (irregular impact device):

Serial Number
name
quantity
1
Irregular impact device
7 types
2
Irregular support ring
12 of them
3
Impact ball head
2 types
4
Replace the impact ball head tool
1 piece
5
Micro on-site printer
1 piece
6
Printer cable
1 item
Seven types of irregular impact devices
Series of irregular support rings
10、 Measurement Range Table:

material
Hardness system
Impact device
D/DC
D+15
C
G
E
DL
Steelcast steel
Steel and cast steel
HRC
17.9~68.5
19.3~67.9
20.0~69.5
22.4~70.7
20.6~68.2
HRB
59.6~99.6
47.7~99.9
37.0~99.9
HRA
59.1~85.8
61.7~88.0
HB
127~651
80~638
80~683
90~646
83~663
81~646
HV
83~976
80~937
80~996
84~1042
80~950
HS
32.2~99.5
33.3~99.3
31.8~102.1
35.8~102.6
30.6~96.8
Steel forged steel
HB
143~650
CWT、ST
alloy tool steel
HRC
20.4~67.1
19.8~68.2
20.7~68.2
22.6~70.2
HV
80~898
80~935
100~941
82~1009
Stainless steel
stainless steel
HRB
46.5~101.7
HB
85~655
HV
85~802
GC. IRON
Grey cast iron
HRC
HB
93~334
92~326
HV
NC、IRON
nodular cast iron
HRC
HB
131~387
127~364
HV
C.ALUM
Cast aluminum alloy
HB
19~164
23~210
32~168
HRB
23.8~84.6
22.7~85.0
23.8~85.5
BRASS
Copper-Zinc alloys
(Brass)
HB
40~173
HRB
13.5~95.3
BRONZE Copper Tin Alloy
(Bronze)
HB
60~290
COPPER Pure Copper
HB
45~315
11、 Technical parameters and application introduction table of irregular impact device:

Irregular impact device
DC(D)/DL
D+15
C
G
E
Impact energy
Impact mass
11mJ
5.5g/7.2g
11mJ
7.8g
2.7mJ
3.0g
90mJ
20.0g
11mJ
5.5g
Ball head hardness:
Ball head diameter:
Ball head material:
1600HV
3mm
tungsten carbide
1600HV
3mm
tungsten carbide
1600HV
3mm
tungsten carbide
1600HV
5mm
tungsten carbide
5000HV
3mm
diamond
Diameter of impact device:
Length of impact device:
Weight of impact device:
20mm
86(147)/ 75mm
50g
20mm
162mm
80g
20mm
141mm
75g
30mm
254mm
250g
20mm
155mm
80g
The maximum hardness of the specimen
940HV
940HV
1000HV
650HB
1200HV
The average surface roughness Ra of the specimen:
1.6μm
1.6μm
0.4μm
6.3μm
1.6μm
The smallest weight of the test piece:
Directly measurable
Stable support is required
Need for dense coupling
>5kg
2~5kg
0.05~2kg
>5kg
2~5kg
0.05~2kg
>1.5kg
0.5~1.5kg
0.02~0.5kg
>15kg
5~15kg
0.5~5kg
>5kg
2~5kg
0.05~2kg
The smallest thickness of the specimen
Dense coupling
Hardened layer with minimal depth
5mm
≥0.8mm
5mm
≥0.8mm
1mm
≥0.2mm
10mm
≥1.2mm
5mm
≥0.8mm
Ball indentation size
When the hardness is 300HV
Indentation diameter
Indentation depth
0.54mm
24μm
0.54mm
24μm
0.38mm
12μm
1.03mm
53μm
0.54mm
24μm
When the hardness is 600HV
Indentation diameter
Indentation depth
0.54mm
17μm
0.54mm
17μm
0.32mm
8μm
0.90mm
41μm
0.54mm
17μm
When the hardness is 800HV
Indentation diameter
Indentation depth
0.35mm
10μm
0.35mm
10μm
0.35mm
7μm
--
--
0.35mm
10μm
Scope of application of impact device
DCType measuring hole or cylindrical tube;DLMeasuring slender narrow slots or holesD-type is used for routine measurement
D+Type 15 contact surface is small and elongated, suitable for measuring grooves or concave surfaces
C-type has low impact force, minimal damage to the tested surface, and does not damage the hardened layer, making it suitable for measuring small lightweight components and surface hardened layers.
GMeasurement of castings and forgings with large thickness and rough surface
EMeasuring materials with extremely high hardness
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