Protimeter humidity box for surface RH measurement
A box that seals to a solid floor and lets the air beneath it equilibrate, so surface relative humidity can be measured without drilling.
Specifications
| Part number | BLD4711 |
|---|---|
| Method | Non-destructive surface RH measurement in solid floors |
Compatible meters
- Protimeter MMS3
- Protimeter MMS2
- Protimeter HygroMaster 2
- Protimeter HygroMaster L
Surface box or in-situ sleeve?
They answer different questions. The humidity box measures the humidity at the surface of the slab, without drilling. A humidity sleeve set into a drilled hole measures humidity at depth inside the slab.
Deep moisture is what fails a floor after an impermeable covering goes down, so a surface reading alone is not a substitute where the specification calls for in-situ testing. Check which method your flooring specification actually requires before you commit — installing to the wrong test is a mistake that only surfaces once the floor lifts.
The box is the right tool where drilling is not permitted — post-tensioned slabs, finished floors, tenanted buildings — and for a fast comparative survey before committing to a full in-situ test.
Box or sleeve — two different tests
The humidity box measures equilibrium relative humidity at the surface of a slab. No hole is drilled, nothing is consumed, and the slab is left intact. The in-situ sleeve test measures relative humidity inside the slab at a set depth, which is what ASTM F2170 and the BS 8201 / BS 8203 family specify.
They do not give the same answer, and one does not substitute for the other. A slab can read acceptably at the surface while holding far more moisture below. If a flooring manufacturer's warranty calls for in-situ relative humidity, a surface box reading will not satisfy it — check the specification before choosing the method.
- HygroMaster 2 with Humidity Box (BLD7759) — the box supplied with a meter
- HygroMaster 2 Flooring Kit — the in-situ sleeve method instead
- Hygrostick (POL4750) and extension lead (BLD5802) — what sits inside the box
Tell us which Protimeter you run and we will confirm the right part before you order.
