Who was that then ?
FITA NICF and The Bourne's Say they are super accurate?
I think who I worked for is largely irrelevant. if you want my CV and credentials I will happily supply them but I think that is largely irrelevant.
Both the NCIF and FITA are closely associated with the contract flooring association. This is the guidance given by the contract flooring association
Testing
Residual Moisture Content - Before floor finishes are laid the moisture content of the screed should be checked. The British Standard for testing a base to receive a floorcovering is to use a hygrometer. This provides a non-destructive test and, when tested strictly to the method defined, will give reliable results on calcium sulphate screeds for RH up to 75% (the required limit for floor finishes).
The moisture content of calcium sulphate screeds is sometimes checked using the CM Test/oven drying Method (BS8204 Part 7). This method is a destructive test and, if used, the moisture content should be less than 0.5% at 75% RH.
this is the technical guidance from Gypsol, the UK's largest anhydrite manufacturer.
Moisture testing is carried out using a suitable approved method such as a flooring hygrometer
or carbide bomb test.
This is the advice within the tiling association guide to tiling to anhydrite screeds
The European Standard for testing calcium sulfate screeds recommends the CM
(Carbide Method) of testing.
This is the advice given in BS8204:7:2003
The determination of relative humidity by hair hygrometer is equally suitable for calcium sulfate based screeds as for cement based screeds because the readings at around 75 % RH will be reliable. However, it should be noted that at higher values of RH, a hygrometer on a calcium sulfate based screed can give misleading results, making it impossible to determine how fast a screed is drying out. For this reason, alternative methods of determining moisture content of calcium sulfate based screeds are often employed.
A CM tester (“carbide bomb”) can be used or a sample can be oven dried at maximum 40 C.
Not a single one of the industry guides or British Standards offers the electronic test meters such as the Tramex as a suitable test method for anhydrite screeds. Don't you think there is a reason for this?
Natural Stone Limestone floor restoration