For the purpose of testing different RH brands a universal sleeve was installed in the sample concrete to ensure that every instrument would be exposed to the same sample information
Shown here are the various RH probes being tested as part of the in-situ RH study.
Shown here are the former variations in hole liner designs.
These cutaways show how several RH equipment manufacturers have addressed the new ASTM requirements. The volume of air being measured is totally captured which results in an RH measurement that is, as it was always intended to be; depth specific