LINSHANG LS252DL User manual

Shenzhen Linshang Technology Co., Ltd.
3/12/2022 Page 1 of 7
LS252DL
Leeb Hardness Tester
User Manual V1.02
Please read this manual carefully before using and reserve it for reference.

Shenzhen Linshang Technology Co., Ltd.
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I. Product Introduction
The Leeb hardness tester detects hardness based on the Leeb hardness measurement principle and
can measure the hardness of a variety of metal materials. The tester adopts advanced dual coil
technology for good repeatability and measurement accuracy. The probe has a built-in direction sensor,
which automatically compensates for the measurement error in different impact directions. The
instrument has a variety of hardness scales, which can be converted between Leeb (HL), Vickers (HV),
Brinell (HB), Shore (HS), Rockwell (HRA), Rockwell (HRB) and Rockwell (HRC). The instrument
employs an impact device DL featuring a thin and long body suitable for hardness measurements in
long, narrow grooves, on tooth surfaces, or on the bottom of bores..
Standards for the product:
GB/T 13794.1 Metallic materials-Leeb hardness test-Part 1: Test method
GB/T 13794.2 Metallic materials-Leeb hardness test-Part 2: Verification and calibration of
hardness tester
GB/T 13794.2 Metallic materials-Leeb hardness test-Part 3: Calibration of reference blocks
GB/T 13794.4 Metallic materials-Leeb hardness test-Part 4: Tables of hardness values conversion
JB/T 9378-2001 Industry standard of Leeb hardness tester
II. Parameters
Probe
Impact device DL
Hardness Scales
HL, HV, HB, HS, HRA, HRB, HRC
Measurement Range
HLD: (170-960); HV(194-976); HB(188-651); HRC(17.6-
68.5); HS(29.54-99.5); HRB(91.5-100); HRA(60-85.8)
Resolution
1HL
Accuracy
±6 HL
Repeatability
6HL
Display
128 * 64 dot matrix OLED

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Power Supply
Rechargeable lithium battery 3.7V@250mAh, full charge for
over 5000 continuous measurements
Charging Port
USB(Type-C)
Size
203*34*24 mm
Weight
78g
Working Temperature Range
-10~50℃，0~85%RH（no condensation）
Storage Temperature Range
-10~60℃，0~85%RH（no condensation）
III. Features
1. The tester uses advanced dual coil technology for good repeatability and measurement accuracy.
2. Direction sensor inside the probe can automatically compensates for the measurement error of
different impact directions.
3. Integrated handheld design, compact and portable
4. Impact device DL is suitable for hardness measurements in long, narrow grooves, on tooth surfaces,
or on the bottom of bores..
5. Providing a variety of hardness scales to switch, no more tedious checking manually
6. Users can calibrate the standard parts to eliminate the error.
7. Low power consumption, and it can work continuously for more than 5000 times.
IV. Operation
1. Power on/off
Power on
Short press button, the version and the serial number of the tester are displayed on the screen after
powering on, and then the instrument will enter the measurement interface and the measured values
before powering off are displayed.
Power off

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Long press the button to shut down the tester or the instrument will automatically shut down when
the time without any operation is longer than 3 minutes.
2. Measurement
Loading
Push down the loading sleeve of the probe to lock the impact body.
Positioning
Press the probe firmly against the surface of the object to be measured and keep it still.
Measurement
Press the release button on the top of the probe to measure the hardness of the object.
3. Setup and Calibration
Press and hold the button for 3 seconds in the off state or press the button briefly in the
measurement state to enter the Main Menu of the instrument with five sub-options, press the briefly to
select [Language, Material, Hardness, Unit, Calibration, Exit], short press the button to confirm the
selection.
Language: Short press button to enter the language option and press button to select the
right language, then press button to confirm your selection.

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Material: Short press the button to enter the material selection interface, short press button
to select the corresponding material, then press the button to confirm the option
Hardness Unit: Press the button briefly to enter the hardness unit selection interface, press the
to select the hardness unit, press the button briefly to confirm.
Calibration: Shortpress the button to enter the calibration interface, the screen prompts [Please
measure the standard hardness block] and flashes, then you can measure the standard hardness
block (single or multiple times). After measurement, the cursor moves to the actual value area, then
press or button to adjust the actual value to the standard value of the hardness block. Long
press the button to save the value, and the instrument indicates “Calibration succeed”, then exit
to main menu interface. In addition, after entering the calibration interface, you can exit directly to the
main menu interface by pressing the button when there is no standard hardness block to be

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measured, and the screen will show “Calibration Failed!”.
Exit: Short press button briefly to exit the main interface and enter the measurement interface.
4. View measurement records
In the measurement mode, press button briefly to view the historical data in the browse interface. The
instrument stores 9 sets of data totally, and the oldest recorded value is automatically deleted when there
are more than 9 sets of data. Record 1 is the earliest test data, and so on backward. Recorded data will
not lost when the instrument is turned off.
In the history view mode or measurement mode, press button briefly and the screen will show a data
deletion prompt, press button to select [Yes] to delete all recorded data and press the button to
delete all record data.
V. Attentions
1. The surface of the test object shall not be too rough，and it needs to be flat, smooth, free of oil and
grease, transmitting a metallic luster.
2. The minimum mass of the test object is 5Kg, and the minimum thickness is 25mm. For objects whose
weight and thickness do not meet the requirements, the test must be coupled with solid bracing.
3. The maintenance of the impact device. After using the device about 1000-2000 times, the user needs
to use a nylon brush to clean the instrument's conduit and impact body. When cleaning, the user needs
to unscrew the support rod of the catheter first, then remove the impact body, insert the nylon brush
into the catheter in a counterclockwise direction, then pull out the bottom and repeat five times, and
finally put the impact body and support rod.
4. After use, the impact body should be loosened.
5. The use of various lubricants is strictly prohibited in the impact device.
6. When measuring, the distance between any two indentations should not be less than 3mm, and the
distance between the center of the indentation and the edge of the object to be measured should not

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be less than 5mm.
7. When the device displays “Low Battery”, batteries should be replaced.
8. The battery needs to be charged regularly to prevent damage from excessive discharge especially
there is no operation of the instrument over 6 months.
VI. Packing list
No.
Product Name
Quantity
Unit
1
Leeb Hardness Tester
1
Set
2
Locating Sleeve
1
pcs
3
USB data cable
1
pcs
4
Nylon Brush
1
pcs
5
User Manual
1
pcs
6
Certificate / Warranty card
1
pcs
VII. Service
1. The gauge has one-year warranty. If the gauge works abnormally, please send the whole gauge to
our company for maintenance.
2. Provide users with spare parts and lifelong maintenance services.
3. Provide the users with the gauge calibration service.
4. Free technical support for the long term.
Manufacturer: Shenzhen Linshang Technology Co., Ltd.
Website: www.linshangtech.com
Service hotline: [phone]
Email: [e-mail]