6
Precision
is how closely repeated measurements agree
with each other. Precision is usually expressed as standard
deviation (SD).
Accuracy
is defined as the nearness of a test result to
the true value.
Although good precision suggests good accuracy, precise
results can be inaccurate. The figure explains these
definitions.
In a laboratory using a standard solution of 2.00 mg/L
cooper and a representative lot of reagent, an operator
obtained with a single instrument a standard deviation
of 0.06 mg/L.
SPECIFICA
TIONS
Range
0.00 to 5.00 mg/L
Resolution
0.01 mg/L
Accuracy
@25
°
C (77
°
F)
±0.02 mg/L ±4% of reading
Light Source
Tungsten lamp
Light Detector
Silicon Photocell with narrow band interference filter @575 nm
Method
Adaptation of EPA approved method. The reaction between copper and
the bicinchoninate reagent causes a purple tint in the sample.
Environment
0 to 50 °C (32 to 122 °F); max 95% RH non‑condensing
Battery Type
9V (1 pc.)
Auto‑Shut off
After 10’ of non‑use in measurement mode;
after 1 hour of non‑use in calibration mode;
with last reading reminder.
Dimensions
192 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Weight
320 g (11.3 oz.)
REQUIRED REAGENTS
Code
Description
Quantity/test
HI93702‑0
Copper HR Reagent 1 packet
PRECISION AND ACCURACY
