604 1-800-452-1261
Water Sampling, continued
Secchi Disk
A relative estimate of the phosphate concentration of a lake can be made using a
Secchi disk to determine water clarity. The disk is lowered into the water and the
depth at which it is no longer visible is recorded. Light extinction depth is determined
and helps to estimate the microscopic plant and animal life supported by the water.
This standard 20 cm diameter limnological disk is black and white on one side, white
on the other, and constructed of durable ABS plastic. Supplied with integral weight
and 48' (15m) of 1/8" nylon cord.
Catalog No. Description Price/Each
AP7175 Secchi Disk $67.20
Seine Net
This durable, easy-to-handle seine is ideal for the capture and census of macroinvertebrates,
minnows and other small fish. Netting is woven polyester with an 1/8" mesh.
The seine is 15' L x 4' D and comes fully assembled with lead weights on the bottom
line, and high-density foam floats on the top line. Fifteen-foot length can be easily
handled by two students. To facilitate use of the seine, a pair of net poles is available
separately. Poles are one-inch diameter, texture-grip aluminum, 51" long, with protective
end caps and holes at either end for tying off seine ropes.
Catalog No. Description Price/Each
FB0679 Seine Net $48.75
FB0587 Seine Net Poles, Pkg. of 2 29.65
Secchi Disk
AP7175
Seine Net Poles
FB0587
Stream Flowmeter, Handheld
Take accurate measurements of stream velocity with this basic, easy-to-use handheld
flowmeter. Just lower the impeller stick into the flow of moving water, attach
“riser rods,” start the counter, and read the digital display on the flowmeter. Includes
durable plastic 3-foot impeller stick that easily disassembles into four sections
for convenient storage, protective pouch to store the flowmeter,
three “riser rods”
to elevate the impeller off the stream bed, and a 30-page operation manual with
laminated calibration charts and reproducible data collection sheets. Operates on
two AAA batteries for over 100 hours of use. Supplied in a handy waterproof storage/
carrying box. Batteries included.
Catalog No. Description Price/Each
AP5284 Stream Flowmeter, Handheld $339.00
Thermometer, Armored
Spirit-filled thermometer encased in tough plastic armor with window opening for
easy reading. Tie-loop is provided at the top of the armor allowing the instrument to
be easily lowered into the water for total immersion. Scale is permanently fused into
the glass and cannot be destroyed. Range is 10–110 °C. Length is 6".
Catalog No. Description Price/Each
AB1145 Thermometer, Armored $25.40
Long-Handled Water Dippers
Collect water samples with ease with this light and economical long-handled water
dipper. Made of high-density polyethylene, the strong honeycomb tube is ribbed
for a sure grip. The polypropylene cup’s threaded fittings securely screw onto the
handle. The handle end has a hook for storage. Available in two lengths, each with a
16-oz dipper cup with two pouring spouts, useful for right- and left-handed people.
Catalog No. Description Price/Each
AP5054 Water Dipper, 3-Foot Handle $46.30
AP5055 Water Dipper, 6-Foot Handle 62.30
Water Sampler
Includes a unique trigger mechanism that requires only one line to raise and lower
the sample chamber and seal it. Efficient flow-through design retrieves an ample
1.5-liter volume of water. Invaluable for monitoring water quality of lakes and determining
how oxygen content and temperature vary with depth. Water sampler is 9 cm
diameter, 46 cm L and supplied with 48 feet (15 m) of 1/8" nylon cord.
Catalog No. Description Price/Each
AB1149 Water Sampler $96.95
WATER SAMPLING continued on next page.
Use a Secchi Disk
to Determine Turbidity
1. Lower the Secchi disk into the water until it just disappears. Read the water
depth from the calibrated line.
2. Raise the Secchi disk until it just appears. Read the water depth from the
calibrated line.
3. Add readings from steps 1 and 2 and divide by 2. Record the Secchi Disk
Transparency in meters.
Readings from a drainage lake—more plankton, silt and organic matter so
less transparent—may be 1.0–1.4 meters. Readings from a seepage lake—more
transparent—may be 3.0–4.0 meters. Readings as high as 19–21 meters would
indicate extreme clarity. Clarity decreases in summer so that same lake may
read only 10 meters during the summer.
Stream Flowmeter,
Handheld
AP5284
Long-Handled
Water Dippers
AP5054, etc.
Thermometer,
Armored
AB1145
Water Sampler
AB1149
Seine Net
FB0679
/
/
/
/
/
/
/
/
/
/
/
/
/
/
/
