DH300 Colorful Screen Hardness Tester is a high cost performance model with colorful high-definition, 320×240 TFT dot matrix and mass storage; 
It is applicable to big workpieces on-site hardness testing and batch testing on the workpieces in production lines. Moreover, it is also used in metal manufacturing industry, transportation, power station, petrochemical industry, aircraft industry, construction, lab, etc


Working Principle:
When the impact body,with a certain weight,impacts against the specimen surface under the action of spring force,leeb hardness comes from the ratio of the impacting velocity(VA) and the rebounding velocity(VB) of the impact body by the moment the spherical testing tip is located at 1mm point from specimen surface.
With principle of electromagnetism,the permanent magnet in the coil of impact device produced an induced voltage, which is in proportion to the impact body velocity.
The leeb hardness values are calculated by the following formula:

HL=1000X(Vb/Va)




Main 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
Material identification in the warehouse of metallic materials
Rapid testing in large range and multi-measuring areas for large-scale work piece

Cover all features and functions of traditional models:

• 7 exchangeable hardness scales (HRA/HRB/HRC/HV/HB/HS/HL); 

• 6 selectable impact devices(D/C/G/DC/DL/D+15) available for special usage, automatically identify the type of impact devices;

• 8 kinds of material available, suitable to measure the hardness of all metallic materials;

• Color display (320×240 TFT) with adjustable backlight;

English displaying and menu operating, the operation is easy and convenient.;

• Max 600 groups(impact times:32~1)of data can be stored at internal non volatile data storage.

• Equips lithiumion rechargeable batteries, Continuous working period: approx. 200 h (no back light on);

  Standard Packing Accessories:

  Optional Accessories:

Every set of our equipement will be carefully tested and double checked steps by steps before being packed and delivery,as we all know that among such fierce international competition,only 100% good quality and stable performance can finally attain the customer's trust.Hence,we will always put the equipment calibraton job in the first place while manufacturing.