Question 1

What is your minimum order quantity (MOQ)? Can I order samples?

Accepted Answer

There is no minimum order quantity for our standard products. You can order a single unit for evaluation or purchase in bulk.

Question 2

Are you a manufacturer or a trading company?

Accepted Answer

We are a manufacturer specializing in the research, development, and production of measuring instruments since 2008. We offer a wide range of instruments for industrial testing applications.

Question 3

How do you ensure product quality? Can you provide certificates?

Accepted Answer

Our instruments undergo quality inspections before shipment. Inspection reports and third-party calibration or testing certificates may be available upon request. Please contact us to confirm availability and any additional fees.

Question 4

What is your warranty and after-sales service policy?

Accepted Answer

Our instruments come with a 12-month warranty. We provide technical support and offer paid repair services after the warranty period.

Question 5

What are your payment methods, delivery terms, and lead times?

Accepted Answer

We accept payments in USD and CNY via T/T or Western Union. Our standard delivery terms include EXW and DAP. Lead times depend on product availability and order quantity. Please contact us for details.

Question 6

Do you offer OEM or customized products?

Accepted Answer

Yes, we offer OEM and customization services. Please contact us with your specific requirements to discuss available options.

Question 7

Are import duties and taxes included in the price?

Accepted Answer

Import duties and taxes depend on the destination country's regulations and are generally not included in the product price. We can provide the HS code for reference. Please consult your local customs authority for applicable charges.

Question 8

What are the minimum mass and thickness requirements?

Accepted Answer

For a D device the workpiece should be at least 5 kg and 25 mm thick when uncoupled, or 3 mm thick when rigidly coupled to a heavy support. A C device needs only 1.5 kg and 1 mm coupled thickness. Below these limits the workpiece vibrates and the rebound velocity is reduced, so the hardness reads low.

Question 9

Which impact device should I choose, D, DC, DL or C?

Accepted Answer

The D device is the universal choice for ordinary metal parts with sufficient mass and thickness. DC has a shorter tube and is used inside holes and cylinders. DL has a very slender tube for grooves, gear teeth and the bottom of bores. C uses lower impact energy for surface hardened layers, thin wall parts and small components that would be deformed by D.

Question 10

How does the LS252DC differ from the LS252DL?

Accepted Answer

The DC device is short and relatively thick, which suits a bore or a cylinder with reasonable access. The DL device is long and slender, which suits a narrow groove, a gear tooth flank or the bottom of a deep bore. Choose by the shape of the space, not by the material.

Question 11

Where is the LS252DC commonly used?

Accepted Answer

It is used for the inside of bearing bores, hydraulic cylinders, tube ends, mould cavities and internal gearbox surfaces, and for any geometry where the 148 mm length of a D device makes contact impossible.

Question 12

What limits the minimum bore diameter?

Accepted Answer

The body and the support ring need clearance, so a bore smaller than about 30 mm cannot be measured reliably with a DC device. For smaller bores a DL device or an ultrasonic contact impedance tester is the correct tool.

Question 13

What is the difference between Leeb, Webster and ultrasonic contact impedance?

Accepted Answer

Leeb measures the rebound of an impact body and suits medium and large metal parts. Webster uses a spring loaded indenter and is popular for aluminium and copper profiles and extrusions. Ultrasonic contact impedance measures the frequency shift of a vibrating rod pressed on the surface, which gives a very small indent and works on thin parts.

Question 14

How do I measure inside a cylinder bore with the LS252DC?

Accepted Answer

Insert the short probe so that the impact direction is radial to the bore, keep the support ring in contact, and trigger. The probe must be perpendicular to the surface at the contact point.

Question 15

What are the key specifications of the LS252DC?

Accepted Answer

Impact device DC, scales HL, HV, HB, HS, HRA, HRB and HRC, HLD range 170 to 960, HV 83 to 976 and HRC 17.6 to 68.5, resolution 1 HL, accuracy within +/-12 HL and +/-6 HL typical, repeatability 6 HL, 128 x 64 OLED, 3.7 V 250 mAh rechargeable battery, Type C charging, and a body of only 88 x 34 x 24 mm.

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