---
product_id: 7969499
title: "NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type)"
brand: "ndtt"
price: "$58"
currency: NZD
in_stock: false
reviews_count: 2
url: https://www.desertcart.nz/products/7969499-ndtt-concrete-hardness-test-hammer-ht-225a-portable-hardness-tester
store_origin: NZ
region: New Zealand
---

# NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type)

**Brand:** ndtt
**Price:** $58
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) by ndtt
- **How much does it cost?** $58 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/7969499-ndtt-concrete-hardness-test-hammer-ht-225a-portable-hardness-tester)

## Best For

- ndtt enthusiasts

## Why This Product

- Trusted ndtt brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

NDTT HT-225A is a compact Concrete Testing Hammer, commonly used for testing of strength and hardness of various types of concrete materials. When testing the strength of concrete, the concrete test hammer uses a certain elastic force to transit the impact force of an impact hammer to the surface of concrete, its initial kinetic energy redistributes, a part of energy in the form of plastic deformation or residual deformation is adsorbed by the concrete, and another part of energy which is proportional to the surface hardness is transmitted to the impact hammer, making the hammer resilie to a certain height, then the strength of the concrete is derived from the proportional relation between the height of resilience and the concrete strength. With the merits of simple structure, easy correction, maintenance and repair, and portability, the concrete test hammer is widely used in civil engineering and construction industry for testing the strength of concrete. Compared to other non-destructive testers, the concrete test hammer is an economical and practical nondestructive testing instrument. HT-225A is used for testing the strength of various concrete members (slab, beam, column, truss) of normal building strength and bridge. The HT 225A is comparable with the Schmidt Hammer, Type N, this method of testing is covered by DIN 1048 and BS1881 part 202, referring to assessment of the rebound hardness of mortar which is directly related to the compressive strengths of the tested material. SUPPLIED WITH: Main unit HT225A, Grinding wheel, Conversion table, User manual, Protective carrying case. Please contact us with any questions about this product.

## Images

![NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) - Image 1](https://m.media-amazon.com/images/I/41Cf7-cIOPL.jpg)
![NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) - Image 2](https://m.media-amazon.com/images/I/41tBD0FFn8L.jpg)
![NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) - Image 3](https://m.media-amazon.com/images/I/51KQtGpWPuL.jpg)
![NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) - Image 4](https://m.media-amazon.com/images/I/4166gHwxQFL.jpg)
![NDTT Concrete Hardness Test Hammer HT-225A Portable Hardness Tester (Schmidt Type) - Image 5](https://m.media-amazon.com/images/I/61p5Jy+L1KL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    Not the best out there but very good value
  

*by J***Y on Reviewed in the United States 🇺🇸 on November 18, 2011*

We bought this hammer to check the strength of some concrete slabs, it arrived within a couple of weeks and it was very easy to use. It needed to be calibrated before we could use it. It gave us good results. If your looking for a basic Schmidtt Hammer then this is the one for you

### ⭐⭐⭐⭐ 







  
  
    Rebound Concrete Test Hammer
  

*by M***O on Reviewed in the United States 🇺🇸 on October 25, 2011*

The instrument is OK.  It seems to be well calibrated.  Documentation supplied with hammer is very well prepared and up to date.  Only concern is that calibration certificate should always be supplied with instrument instead of being sent upon special request.

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-05*