Maintenance and Precautions: 1. Hanging the dynamometer vertically when in use, and adjust it through the upper thread so that the indicator points to the "0" scale line. 2. Put the dynamometer flat in the box after use, and don't be squeezed by heavy objects. 3. Wipe clean the plastic cylinder and overflow cup of the plastic bucket after use. Cultivate Learning Ability: Cultivate learning ability to lay a foundations for children to learn mathematics, physics and chemistry in the future. Mainly used in middle school physics teaching, to explore the relationship between buoyancy and the object's boiled water. Interesting Experiment: The experimental assembly is simple, the experimental effect is novel and interesting, and the experimental ability is improved. Operate Step: Use a dynamometer to weigh out any object to be measured. Calculate its mass, then immerse it in the overflow cup, weigh the liquid discharged from the overflow cup with a dynamometer to calculate the volume V, which is the volume of the measured object (any irregular shape is acceptable). Explore Physical Phenomena: Can stimulate children's interest, practical ability, exploration spirits, imagination, analytical ability, etc. Complete tools, you can operate it yourself, suitable for DIY enthusiasts.
Maintenance and Precautions: 1. Hanging the dynamometer vertically when in use, and adjust it through the upper thread so that the indicator points to the "0" scale line. 2. Put the dynamometer flat in the box after use, and don't be squeezed by heavy objects. 3. Wipe clean the plastic cylinder and overflow cup of the plastic bucket after use. Cultivate Learning Ability: Cultivate learning ability to lay a foundations for children to learn mathematics, physics and chemistry in the future. Mainly used in middle school physics teaching, to explore the relationship between buoyancy and the object's boiled water. Interesting Experiment: The experimental assembly is simple, the experimental effect is novel and interesting, and the experimental ability is improved. Operate Step: Use a dynamometer to weigh out any object to be measured. Calculate its mass, then immerse it in the overflow cup, weigh the liquid discharged from the overflow cup with a dynamometer to calculate the volume V, which is the volume of the measured object (any irregular shape is acceptable). Explore Physical Phenomena: Can stimulate children's interest, practical ability, exploration spirits, imagination, analytical ability, etc. Complete tools, you can operate it yourself, suitable for DIY enthusiasts.
Sellers offer a range of delivery options, so you can choose the one that’s most convenient for you. Many sellers offer free delivery. You can always find the postage cost and estimated delivery date in a seller’s listing. You'll then be able to see a full list of delivery options during checkout. These can include: Express delivery, Standard delivery, Economy delivery, Click & Collect, Free local collection from seller.
Your options for returning an item vary depending on what you want to return, why you want to return it, and the seller's return policy. If the item is damaged or doesn't match the listing description, you can return it even if the seller's returns policy says they don't accept returns. If you've changed your mind and no longer want an item, you can still request a return, but the seller doesn't have to accept it. If the buyer changes their mind about a purchase and wants to return an item, they may need to pay return postage costs, depending on the seller's return policy. Sellers can provide a return postage address and additional return postage information for the buyer. Sellers pay for return postage if there's a problem with the item. For example, if the item doesn't match the listing description, is damaged or defective or is counterfeit. By law, customers in the European Union also have the right to cancel the purchase of an item within 14 days beginning from the day you receive, or a third party indicated by you (other than the carrier) receives, the last good ordered by you (if delivered separately). This applies to all products except for digital items (e.g. Digital Music) that are provided immediately to you with your acknowledgement, and other items such as video, DVD, audio, video games, Sex and Sensuality products and software products where the item has been unsealed.
Sellers have to offer a refund for certain items only if they are faulty, such as: Personalised items and custom-made items, Perishable items, Newspapers and magazines, Unwrapped CDs DVDs and computer software. If you used your PayPal balance or bank account to fund the original payment, the refunded money will go back to your PayPal account balance. If you used a credit or debit card to fund the original payment, the refunded money will go back to your card. The seller will effect the refund within three working days but it may take up to 30 days for Paypal to process the transfer. For payments funded partially by a card and partially by your balance/bank, the money taken from your card will go back to your card and the remainder will return to your PayPal balance.