Macherey-Nagel
On demand
Macherey-Nagel test strips for total chlorine, in one presentation.
932004
A semi-quantitative test strip for total chlorine, read on a reflectometer rather than against a colour chart. Dip it, wait the stated time, and compare the pad against the colour scale on the tube.
DiaQuant strips read on a reflectometer instead of by eye. The colour scale is replaced by an instrument reading, which removes the two weaknesses of visual comparison: the operator's judgement and the operator's lighting. For chlorine that matters, because the decision is often close to a limit and two people comparing the same pad to the same chart routinely disagree by a step.
A strip gives a range, not a figure. That is enough for the great majority of decisions — dose or do not dose, discharge or hold, keep running or stop — and it gives the answer where the sample is, in about a minute, with no instrument to calibrate and nothing to carry back to a laboratory.
When a number has to be defensible — a regulatory report, a dispute, a limit you are close to — a photometer or a laboratory method is the right tool. The strip's job is to tell you whether you need one.
These strips are made for the reflectometer's calibration; reading them visually gives a worse result than a strip designed for the eye.
Supplied in one presentation.