Keep my session open?
Ending In 
The session is expired
Your session has expired. For your security, we have logged you out.
Would you like to log in again?

CENCO® Coulomb and Current Apparatus

SE1003 IF-564 PH 1338 2353 WARD470014-660 2353A 318S
This apparatus is full of activities.

  • Sensitive Torque Arm
  • Straight Aluminum Rods
  • Instructions Included
  • Adjustable Counterweight
  • Optical Lever
The sensitive torque arm has as adjustable counterweight and an optical lever for measuring tiny forces with the null method. It comes with a pair of straight aluminum rods that measure the repulsive force between parallel, current-carrying conductors and a pair of plates for measuring the attractive force between charged capacitor plates. A current of five to 10A is required to cause sufficient deflection in the electromagnetic experiment. Users then add fractional weights to a small pan attached to the upper conductor rod to return the balance to its original position, which determines the force between the conductors.

The result can be interpreted to confirm the dynamic definition of the Ampere or to determine the permeability of air. The analogous electrostatic experiment may be used to find the permittivity of air. From these two values, an indirect estimate of the speed of light can be made.

Ordering information: This apparatus requires a laser pointer and scale for the optical lever, fractional weight set for the current experiment, precise multimeter to measure volts and amps, 300V variable high voltage source, and AC or DC current source for 10A. Instructions are included.



Item # Description Unit Availability Price Quantity
470014-660 Cenco Coulomb and Current Apparatus
Each Retrieving
470016-194 Current Apparatus Only, 30 x 36 cm
Each Retrieving
470016-192 Coulomb Balance Accessory
Each Retrieving

Laser Pointer for Apparatus
Item # Description Unit Availability Price Quantity
470111-384 Extra Bright Laser Pointer, Wavelength: 635 nm , 5 mW (Class IIIA U.S. CDRH)
Each Retrieving

Weight Set for Apparatus
Item # Description No. of Weights Unit Availability Price Quantity
470204-258 Cylinder Weights, 1 mg to 500 mg
12 Weights Kit of 12 Retrieving

Power Supply for Apparatus
Item # Description Unit Availability Price Quantity
470039-718 5kV Power Supply, 110VAC, 3 mA, 25 x 20 x 13 cm, Voltage Output: 0–5,000VDC, Weight: 1.3 kg
Each Retrieving
470163-994 Power Supply, 0-30V, 20A
Each Retrieving


Voltage 0-30V, 20A (110V Input Voltage)


Item # Description Frequency No. of Weights Unit Availability Price Quantity
470111-384 Extra Bright Laser Pointer, Wavelength: 635 nm , 5 mW (Class IIIA U.S. CDRH)
- - Each Retrieving
470204-258 Cylinder Weights, 1 mg to 500 mg
- 12 Weights Kit of 12 Retrieving
470039-718 5kV Power Supply, 110VAC, 3 mA, 25 x 20 x 13 cm, Voltage Output: 0–5,000VDC, Weight: 1.3 kg
- - Each Retrieving
470121-628 Benchtop Multimeter
10Hz to 1MHz - Each Retrieving
470122-684 Plastic Metric Ruler
- - Pack of 12 Retrieving
470163-994 Power Supply, 0-30V, 20A
- - Each Retrieving


Need help?

  • Whatever you have to say, positive or negative, is important to us.
  • Providing feedback takes only seconds.
  • Your feedback will be made available to the public on the web. will publish your name as user.
You can use this name, or edit and save a nickname.
We recommend authors use their first and last initial.

Please confirm your profession

Example: Education

Please confirm your role

Example: Teacher

Please confirm your location

Example: New York, NY


Total Ratings: 0
Avg. Ratings: 0.0 out of 5

Sort all by:

Review & Compare Alternatives
We found alternative products that can save you up to  per item-unit.  To compare product details, select up to 3 alternatives below and click Compare Selected. To add items to your basket, enter a quantity and click Add to Basket.

Original Product:

Description Catalog Number Availability Unit Your Price Price Per Qty

Terms and Conditions

Fast Ordering, Clear Answers
Ordering from Sargent Welch is Fast, Easy, and Hassle-Free

Find all the information you need here to place your order.

Terms and Conditions of Product Sale
All orders are governed by the Terms and Conditions of Product Sale accessible here. By placing and order, you represent that you have read and agree to the Terms and Conditions of Product Sale.

Shipping Terms
All orders will incur shipping and handling fees added to the order total value. Shipping charges may vary based on the nature of the product, total weight, destination, delivery date, and delivery method. Orders will ship via UPS carrier at current published rates. Shipping costs are estimated at time of online order. Orders required to ship by motor freight may incur an additional shipping charge. All orders $24.99 or less (pre-tax) will be subject to an additional $7.00 handling fee. Our shipping terms are FOB shipping point unless otherwise specified. For more information about specific shipping terms for your account, contact your Sargent Welch Account Manager. Visit to locate a representative in your area.

Order Online and Save!
Receive FREE standard ground shipping on orders of $250 or more when you place your order online at with promo code FREESHIP250. Order total must be at least $250 before tax; total may include live and hazardous materials, however these materials will remain subject to standard shipping charges and fees. Excludes Alaska and Hawaii, and may exclude some motor freight shipments.

Chemical & Hazardous Shipping Fee
Materials classified as hazardous by the D.O.T. may include, but are not limited to, chemicals, microbiological specimens, or activity kits containing these materials. If your order contains an item classified as hazardous by the D.O.T., a minimum $27.50 fee will be charged for each order. Orders for chemicals and hazardous materials will only be accepted from educational and research institutions; we will not ship chemicals to individuals. Select chemicals are now available with Poison Packs to enable faster shipping. Previously, these chemicals shipped freight within 7-14 days and incurred a $70.00 freight shipping charge. Now, added Poison Packs enable your chemicals to ship via UPS to arrive within 3-4 days, eliminating the $70 freight charge. For a list of chemicals that include Poison Packs, visit

Live Materials Delivery & Guarantee
All micro life cultures will be delivered to you within two business days when order is placed before 12:00 pm EST. Your specimens or cultures will arrive in good condition or we will send a free replacement. Requesting a delivery date of Wednesday, Thursday, or Friday ensures healthy delivery of your live specimens. Live materials will not be delivered on Mondays. For Tuesday deliveries, additional shipping charges may apply. Contact Sargent Welch customer service (800-727-4368) to arrange a Tuesday live materials delivery. For live materials coupon redemption, visit In instances of severe weather, we may delay or cancel a shipment if it will not arrive safely. See our live materials page for the latest updates if you suspect weather could be an issue in your area. If your school is closed due to weather, please call customer service to let us know and we will hold you specimen and reschedule at your convenience.

Bacteria and Pathogens
Shipping pathogens and bacterial cultures to high schools and individual is prohibited by the Federal Health Service. State or local authorities may require a permit before we can ship pathogens to you. Colleges and universities are permitted to order pathogens and bacterial cultures through an institutional purchase order only.

Product Representation
Every effort is made to ensure accuracy in out product images, descriptions, and pricing prior to publication. However, due to occasional changes made by vendors after the date of publication, the physical appearance of items may change or vary in color from what is shown in the catalog. We assure the items you receive will satisfy all product specifications and requirements. Catalog pricing and product availability is subject to change. If a typographical error in pricing should occur, we are not obliged to honor the misprinted price. Please check our website for the most recent updates to product images, descriptions, availability, and pricing.

Your Favorite Items, Always in Stock
Thousands of our best-selling products are always stocked and ready when you need them, so you don't have to wait for the items you use most. Items are shipped within 48 hours of ordering when order is received electronically or by phone prior to 1:00 PM EST. In-stock promise and 48-hour shipping time excludes hazardous chemicals and exceptional order quantities which will be made available at lead time. Availability subject to change in the event of natural disaster or forces of nature affecting sourcing, shipping, transportation, or availability of living materials required for producing saleable goods. Sargent Welch will contact the customer directly to communicate the occurrence of such an event and provide alternative materials when available. Current stock and availability for all products is available online on every product page.

Promotional Exclusions
Unless otherwise specified, any item with a price ending in '9' (i.e. $5.09, $14.99, $100.89) is excluded from special offers, discounts, and promotions. Promotional discounts may not be combined with any other offers, discounts or promotions. Offers for free shipping include standard ground shipping only.

Credit & Invoicing 
Credit is extended to all educational institutions. Terms are net 30 days from the date of invoice. Teachers' personal orders are always welcome. For more information email

Sales Tax
Sales tax (state and local) will be included on your invoice. If you are exempt from sales tax, please provide proper documentation when placing your order. 

100% Satisfaction Guaranteed Returns
We accept product returns for any reason within 60 days of purchase. Items returned must be unused and in original packaging. To return an item for refund, replacement, or credit, please email or call 800-727-4368 for a return authorization number and further instructions for return. Please have your order number readily available so that we can better assist you. In some cases, a restocking fee may apply. Items returned without prior authorization may not be accepted or credited. Items under warranty will be replaced or repaired at our discretion. To ensure the quickest return or replacement, we recommend you inspect all packages immediately upon arrival to ensure your satisfaction. A carrier inspection may be required.

Print These Terms