The 'Smart' Colorimeter

DR/800 Series Colorimeter

	Combines ease of use with a high testing capability and field readiness.
	Analysis requires minimum of time and preparation.
	Results displayed directly on the large liquid crystal display in concentration, percent transmittance or absorbance units.
	*Features include:*
	Easy to use software offering push button method selection and a pre-programmed timer.
	Datalogging capabilities
	User generated calibrations

Choose from 3 models depending on your needs:

Model No	Description
DR/820	Pre-Programmed to test for at least 20 parameters
DR/850	Pre-Programmed to test for at least 50 parameters
DR/890	Pre-Programmed to test for at least 90 parameters

Pocket Colorimeter

	Weighs less than 200 grams.
	Pre-Programmed for a single parameter.
	Provides direct readout in concentration units.
	Supplied with carrying case, apparatus and reagents for up to 100 tests.
	Four AA alkaline cells supply the power for more than 300 tests.
	Offers accuracy comparable to far more expensive laboratory instruments.

Dissolved Oxygen Meters

The DO meter is ideal for oxygen measurement in rivers, lakes and waste water, as well as for BOD measurements, Oxygen concentration, saturation index and temperature can be measured.

High Quality, Multizone pH Indicator Paper

	A range of pH papers in reel form.
	Impregnated with 2, 3 or 4 indicating dyes.
	Each roll is 6 meters long.
	Supplied in plastic dispenser, which includes the printed colour scale.
	A range of papers in strip form.
	Especially suitable for testing turbid and coloured solutions.
	Sensitivity down to values of 0.05pH
	Box of 200 strips.

Quantofix Indicator Paper

	For the semi-quantitative determination of ions.
	A Quantofix test stick is a plastic strip, 0.2mm thick, with a test paper sealed at the lower end.
	The size of the test paper area permits a clear comparison with the fields of equal size of the colour scale provided on the plastic box.
	The length of the test sticks is sufficient to permit easy handling even in cases where aggressive or noxious solutions are to be tested.
	The plug of the vial contains a dessicant for increased shelf life of the sticks.
	Some Quantofix test sticks are highly specific, where interferences are possible they can be eliminated by precipitation or masking.
	25 available tests Aluminium ............ to Zinc.

pH-Fix Indicator Paper

	Colour fixed, non-bleeding.
	Measurement of pH value is possible in unbuffered or very weakly buffered solutions - sticks can be left in the solution until final colour change is completed.
	Test samples are not contaminated by the indicator dyes.
	Colours of individual colour fields cannot run into each other. This allows a more precise comparison with the colour scale.

Common Reasons For Incorrect or Poor Readings

Recent Water Treatments for Fish Health.
Some chemicals used for dip, bath and flush treatments can cause adverse reactions with the reagents in test kits resulting in incorrect results. Ideally tests should NOT be taken within a period equivalent of at least two tanks of water turnover time after a treatment.

Contaminated Skin.
Using your thumb across the top of a test tube to shake it might seem like a good idea at the time, BUT chemicals on your skin (as well as the skins naturally acidic oils), can cause incorrect results. ALWAYS use the caps provided.

Poorly Washed Equipment.
After each test ALWAYS rinse/wash the equipment to be used first in distilled water (*tap water is NOT suitable, as it can contain quite high levels of chemicals, which could interfere with the results). Then just prior to filling the test tube with the sample, rinse it well with the sample to be taken.

Incorrect Quantities.
Make sure that the sample size that you are testing (e.g. 5ml, 25ml, etc) is compatible with the reagents, otherwise falsely high or low results may be obtained.

Use By Dates.
Make sure the test kits you are using are NOT out of date. Throw away any out of date kits ... it is usually better not to test at all , than to rely on the readings of a kit that may or may not be right for your actions. Test kits which have an expiry date on them, have it for a reason.

Measurements.
Whenever taking measurements, write the results down. Trying to remember them in your head whilst you walk back to the farm office, will eventually lead to mistakes.

Correct Sampling Procedures

Getting the best out of your water sampling test kits depends on the methods by which you use them. The minimum number of tests that you should carry out at any one point is two.

There should ideally be taken from two independently taken samples - taken at the same time. This can help avoid relying on the results of a poorly taken, or contaminated sample. If results show a discrepancy between first two or three samples, or if the results so not appear realistic, the methods used to sample and test should be reassessed, and more tests taken and the instruction referred to.