产品介绍

1. Product introduction: 

The special standard calibration plate of concrete resistivity tester is developed according to the 5.1.2.1 resistivity plate of 

JJG(transportation) 159-2020 concrete resistivity tester.  

It is a special measuring instrument for each institute and third party center.

2. Verification conditions

The verification environmental conditions are as follows:

a) Ambient temperature: 23℃±5℃;

b) Ambient humidity: no more than 85%RH.

Calibrating instrument

1. Prepare five resistivity boards. The structure diagram of each board is shown as follows.