Order #1066 – armored non-mercury
thermometer. Cost is about $20, multiuse.
pH test strips
Order #27456 for 50 pH test strips. Cost is about
$0.30 per test.
We use a model manufactured by:
Lawrence Enterprises Inc.
P.O. Box 344
Seal Harbor, ME 004675
Approximate cost is $34 per tube, with possible
discounts for quantity purchase.
This or similar tubes may be available from several suppliers
including Ben Meadows and Forestry Supply.
Longer tubes are available. We suggest the
60-inch tube because it is long enough to be
accurate, and short enough to be easy to use.
Loveland, CO 80539-0389
Nitrate/nitrite test strips: order #27454
Ammonia test strips: order #27553
Cost: About $0.60 per test
Calverton, VA 20138-9850
Order # K-8510 “Ortho P kit.” Each will do
Order #R-8510 for refill tubes and A-8500 for
The blue color in the reference tubes will fade
slightly over a period of months, so note the
expiration date on your kit and reorder new
comparison tubes (a new kit) every few years.
Cost is about $1.07 per test with one kit and one refill.
3M Microbiology Products
3M Center, Building 275-5W-05
These are the plates for the coliform and
E. coli bacteria:
6484 50 EC plates
6414 500 EC plates
A second product is available from
3M (not described in the lesson plan)
for assessing contamination on surfaces,
such as kitchen work space, or garden vegetables
that may have been contaminated from manure
or compost. For these types of samples, order the
3M quick swabs, listed below.
6432 50 quick swabs (for surfaces)
6433 250 quick swabs (for surfaces)
P.O. Box 92912
Rochester, NY 14692-9012
18W 2972 sterile pipets (500)
P.O. Box 686
Monrovia, CA 91017
Cost when purchasing an individual kit is close
to $10, but the cost goes down to around $5 per
test when purchasing 50 or more. This may vary
and should be negotiated with the sales
representative at the time of purchase. There are
several “Water-Safe” test kits now available, and
some include a lead + atrazine combination,
which may be appropriate if you are testing
your household water and are concerned about old
pipes, brass fixtures and pump impellers or other
sources of lead.