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Nature Abhors A Vacuum
But science teachers can't work without them. Experiment with this good-quality manual vacuum pump made of durable polychloroethylene plastic. Works with a pistol-grip action and pulls up to 2" Hg. Includes a 17" length of clear vinyl, 1/4" ID tubing, and a release valve.
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93305 VACUUM HOME PUMP |
Pocket Microscopy
Good things come in (2) different small packages. Our pocket microscopes are compact and perfect for a clear, close look at stamps, coins, flora, insects or assorted minutiae. The 30X version measures 5-3/4" x 1-5/8" x 3/4" in black plastic with a focus knob, on/off switch, small LED for illumination, and a vinyl carrying case. Requires (2) "AA"s. The 60X version is a microscopic 3-1/4" x 1-3/16" x 3/4" and has a built-in white LED illuminator powered by (3) coin-cell batteries that are included. Magnifies from 60-100X, with coarse- and fine-focus knobs, and has a vinyl carrying case.
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93252 60X MICROSCOPE | |
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34407 POCKET MICROSCOPE |
Filtering Flask
From Bomex, this glass filtering flask is 500ml, stands 7" tall x 4-3/16" dia at the base, with a 1-7/16" dia mouth. The flask takes a #8 stopper and a 9mm OD outlet nipple.
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92847 FILTERING FLASK |
Electronic Plant Monitoring
You can’t trust nature (it’s red in tooth and claw, remember?) but you can monitor its effect on plants with any of these electronic meters. The pH meter has a 7-1/2" long metal probe with a 1-5/8” x 3/4” ballistic meter on top that displays pH from 3 to 10. The moisture meter has a 7-1/2” long probe with a 1-1/2” x 3/4” ballistic meter, and measures 11” long OA, with a watering chart on the back of the package. No batteries: they work via chemical reaction to different metals (either that or it’s magic).
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38772 MOISTURE METER | |
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38097 PH METER |
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