MH310 Leeb Hardness Tester
100 measurement series.(Relative to average times 32～1) USB1
about 150 hours（with default brightness）
MH310 portable Leeb hardness tester, based on Leeb hardness measuring principle, quick and easy on-site test the hardness of series metal materials, support free conversion between Leeb, Brinell, Rockwell hardness scale and others,It uses high-contrast segment LCD to display clear ,stable performance. integrated high-speed thermal printer ,which can print on-site measurements. It is widely used in annealing, tempering, quenching , quality control for the work piece; hardness testing for machine tool and automobile chassis ; on-site hardness testing of in-service non-removable parts ; quality testing for hardware, forging, machine tools and special steels; quality control for batch production process and so on.Good quality and effective cost ,which is a wise choice for regular need of hardness testing .
Function & application
Die cavity of molds
Bearings and other parts
Failure analysis of pressure vessel, steam generator and other equipment
Heavy work piece
The installed machinery and permanently assembled parts.
Testing surface of a small hollow space
Requirements of formal original record for test results
Material identification in the warehouse of metallic materials
Rapid testing in large range and multi-measuring areas for large-scale work piece
The energy quotient is quoted in the hardness unit HL and is calculated from comparing the impact and rebound velocities of the impact body. It rebounds faster from harder samples than from softer ones, resulting in a greater energy quotient which is defined as 1000×Vr/ Vi.
HL— Leeb hardness value
Vr — Rebound velocity of the impact body
Vi — Impact velocity of the impact body
Working temperature：- 10℃～＋50℃；
Relative humidity: ≤90％；
The surrounding environment should avoid of vibration, strong magnetic field, corrosive medium and heavy dust.
Error and repeatability ：Impact device D 760±30HLD,±6 HLD；
Impact device DC 760±30HLDC,±6HLDC；
Impact device DL 878±30HLDL,±12HLDL；
Impact device D+15 766±30HLD+15,±12HLD+15；
Impact device G 590±40HLG,±12HLG；
Impact device C 822±30HLC,±12 HLC；
Impact direction：vertically downward, oblique, horizontal, oblique, vertical upward, automatically identify
Material：Steel and cast steel,Cold work tool steel,Stainless steel,Grey cast iron,Nodular cast iron,Cast aluminum
alloys,BRASS(copper-zinc alloys),BRONZE(copper-aluminum/tin alloys),Wrought copper alloys
Paper roll: width (57.5 ± 0.5) mm, diameter: 30mm, long-term imports of paper to ensure long-term data storage
Display：High-contrast Segment LCD
Integrated data memory： 100 measurement series.(Relative to average times 32～1)
Battery: 6V( Ni-MH battery pack)
Continuous operating period：about 150 hours（with default brightness）
Based on the principle of Leeb hardness testing theory. It can measure many metallic material
One main unit can match to 6 impact devices
Support Steel ,when using D/DC sensor to test steel,it can show HB directly,no need to check manually.
High-contrast Segment LCD ，easy to use
Software calibration automatically.
100 groups (impact times 32 ~ 1) hardness measurements, each set of data includes single testing value, average value, measurement date / time, impact direction, frequency, material, hardness, and other information.
Real-time display the remaining battery power, charging progress is displayed while charging.
High brightness EL back-light display for easy use in dimly environment.
Automatic sleep and shutdown and other power-saving features
Integrated thermal printer with the instrument as a whole, and quiet operation, fast print speeds, you can print the test report on-site.
Equipped with PC software (optional), with functions of measurements transmission , value storage management, statistical analysis of the measured value, the print report of measured value, batch setting instrument parameters , to meet the higher requirements of quality for activities and management.
Small size, portable, , stable and reliable performance, suitable for harsh environment field operations, prevent from vibration, shock and electromagnetic interference.
Operating Method and Attentions
----Insert the plug of the impact device into the socket of impact device on the instrument.
----Press the power key，now power is on. The instrument is in working mode.
Pushing the loading-tube downwards until contact is felt. Then allow it to slowly return to the starting position or using other method locking the impact body.
Press the impact device supporting ring firmly on the surface of the sample, the impact direction should be vertical to the testing surface.
----Press the release button on the upside of the impact device to test. The sample and the impact device as well as the operator are all required to be stable now. The action direction should pass the axis of the impact device.
----Each measure area of the sample usually need 3 to 5 times of testing operation. The result data dispersion should not more than mean value±15HL.
----The distance between any two impact points or from the center of any impact point to the edge of testing sample should conform to the regulation of Table 4-1.
---- If want accurate conversion from the Leeb hardness value to other hardness value, contrastive test is needed to get conversion relations for the special material. Use inspection qualified Leeb hardness tester and corresponding hardness tester to test at the same sample respectively. For each hardness value, each measure homogeneously 5 points of Leeb hardness value in the surrounding of more than three indentations which need conversion hardness, using Leeb hardness arithmetic average value and corresponding hardness average value as correlative value respectively, make individual hardness contrastive curve. Contrastive curve at least should include three group of correlative data.
Type of Impact Device
Distance of center of the two indentations
Distance of center of the indentation to sample edge
Not less than (mm)
Not less than (mm)
5 Read Measured Value
After each impact operation, the LCD will display the current measured value, impact times plus one, the buzzer would alert a long howl if the measured value is not within the valid range. When reaching the presetting impact times, the buzzer will alert a long howl. After 2 seconds, the buzzer will alert a short howl, and display the mean measured value.
---- Replacing the impact device must be done during Power off. Otherwise the main body could not identify the type of the impact device, and it may damage the circuit board of the main body.
----You could not save the current test value if the impact time is less than the presetting times value.
---- Only type D and type DC of impact device have the function of strength test option. You can not change the setting to strength testing when using other types of impact device. The setting would be set to hardness testing automatically after replacing the impact device whether the setting is hardness testing or not before.
---- Not all materials could convert to all hardness scale value. The hardness scale is reset to HL automatically after changing the material. So select material firstly before changing the hardness scale.