ReviewsEntry level Chemistry

Rx Clear Calcium Plus | Granular Calcium Chloride | Raises Calcium in Swimming Pool Water | Hardness Increaser for Swimming Pools | Helps Prevent Corrosion | 25 Lbs

...ion of metal surfaces such as light fixtures, railings, ladders, screws, pool cover components, pool heater components, and metals in your pump or filter. Also prevents etching, pitting, and delamination of concrete, plaster, gunite, shotcrete, and fiberglass pools..
WATER CHEMISTRY - One of the most important aspects of proper swimming pool care involves the maintenance of balanced water chemistry. When swimming pool chemicals are not at their ideal levels, swimmers can be at risk of contracting illnesses and suffering from skin irritation, the water can turn dull and cloudy, and pool or spa equipment, hoses, and surfaces can become damaged..
DOSAGE - The ideal range is 200 to 400 parts per million (ppm). Six lbs. per 10,000 gallons will raise the hardness level approximately 50 ppm. The minimum calcium hardness level is 150 ppm. Trust Rx Clear as the most reliable leader in pool cleaner products and supplies..

WHITE SALT TEST STRIPS: Tests the salt (sodium chloride) levels for pools with salt generator systems.
White titrators measure levels from 400 to 7,000 ppm.
AQUACHEK ACCURACY: Using medical industry technology, our test strips offer comparable accuracy to liquid tests.
No measuring & counting drops of reagent, leaving less room for error.
EASY TO USE: Just dip the test strip & remove it.
Water chemistry insert & directions included.
Test water at least twice a week for safe, balanced water.
SAFE & CLEAN WATER: Pool testing strips offer simple & accurate way to ensure your salt generator will produce the correct amount of chlorine to keep water healthy.
FREE MOBILE APP: Receive a tailored treatment plan when manually inputting your results.
Record, track, & monitor your pool’s chemistry with AquaChek Connect.

48 kids microscope prepared slides of entomology, botany and mammology specimens for kids, entry-level students or home school programs.
Selected fine specimens from various categories, colored labels enable an easy classification.
Dimensions: 60mm x 20mm x 1 mm. Material: plastics.
Brand new from factory. No risk of contamination from previous use.
For some slides (like insects ...), stereo microscopes with top and bottom lights instead of compound microscopes give the best microscopy images..

48 kids microscope prepared slides of entomology, botany and mammology specimens for kids, entry-level students or home school programs.
Selected fine specimens from various categories, colored labels enable an easy classification.
Dimensions: 60mm x 20mm x 1 mm. Material: plastics.
Brand new from factory. No risk of contamination from previous use.
For some slides (like insects ...), stereo microscopes with top and bottom lights instead of compound microscopes give the best microscopy images..

Lifetime Guarantee and 100% made in the USA.
The Odyssey Fly Tying vise is a true 360 degree rotating vise that come with a c-clamp and bobbin cradle..
An entry level Fly Tying Vise at an entry level price.
Made from the finest materials and made to last a lifetime.

Make a hilarious gift for chemistry students, science, chemistry teachers, chemistry nerds. Fluorine uranium Carbon Potassium Science T-shirt is A smart arrangement of elements of the periodic table makes a funny chemistry joke shirt..
The Perfect and Unique Gift for Men, Women, Kids, Youth, Boys, and Girls, chemistry students, science, chemistry teachers, chemistry nerds on Holidays and Special Occasions. We offer shirts to buy for Christmas, Xmas, Halloween, birthday or normal days..
Lightweight, Classic fit, Double-needle sleeve and bottom hem.

Make a hilarious gift for chemistry students, science, chemistry teachers, chemistry nerds. Fluorine uranium Carbon Potassium Science T-shirt is A smart arrangement of elements of the periodic table makes a funny chemistry joke shirt..
The Perfect and Unique Gift for Men, Women, Kids, Youth, Boys, and Girls, chemistry students, science, chemistry teachers, chemistry nerds on Holidays and Special Occasions. We offer shirts to buy for Christmas, Xmas, Halloween, birthday or normal days..
Lightweight, Classic fit, Double-needle sleeve and bottom hem.

Make a hilarious gift for chemistry students, science, chemistry teachers, chemistry nerds. Fluorine uranium Carbon Potassium Science T-shirt is A smart arrangement of elements of the periodic table makes a funny chemistry joke shirt..
The Perfect and Unique Gift for Men, Women, Kids, Youth, Boys, and Girls, chemistry students, science, chemistry teachers, chemistry nerds on Holidays and Special Occasions. We offer shirts to buy for Christmas, Xmas, Halloween, birthday or normal days..
Lightweight, Classic fit, Double-needle sleeve and bottom hem.

WHITE SALT TEST STRIPS: Tests the sodium chloride levels for pools with salt generator systems.
White titrators measure levels from 400 to 7,000 ppm.
AQUACHEK ACCURACY: Using medical industry technology, our test strips offer comparable accuracy to liquid tests.
No measuring & counting drops of reagent, leaving less room for error.
YELLOW 4-IN-1 TEST STRIPS: Tests the most critical parameters for keeping a balanced pool.
Tests for Free Chlorine, pH, Total Alkalinity, & Cyanuric Acid.
EASY TO USE: Dip the test strip & remove it to find out results.
Test water at least twice a week for safe, balanced water.
FREE MOBILE APP: Receive a tailored treatment plan when manually inputting your results.
Record, track, & monitor your pool’s chemistry with AquaChek Connect.

Engineering, Surveying, Science, Medicine, Display type: LCD.
Adjustable contrast with 2 lines x 14 characters + indicators, 14 character dot matrix (5 x 7).
SAT Subject Tests in Mathematics Level 1 and Level 2.
Dimensions (W X D X H): 3.23 x 0.72 x 6.22 Inch. Warranty: 1 year warranty (may vary by region).
Built-in functions: Over 100, Memory registers: 800, Memory: 30 KB, Power: 2 x CR2032 batteries.
battery life: 0.73 year @ 1 hr/day (approximately 9 months).

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