Best in 7 days
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Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jun 22 - Jun 27
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For Your Every Summer RSVP, with Code: SUMMER15
Description
Astronomical Diffraction Grating - 100 or 200 line/mm, Diameter 50 mm, unmountedHigh efficiency blazed diffraction grating with 100 or 200 line mm spacing. This grating can be integrated with a telescope, camera, filter wheel, lab bench, or custom setup. Supplied unmounted on 1. 1 mm AR coated glass. Diameter: 50 mm (2 in). Its larger aperture collects significantly more light than the 25 mm Star Analyser series. Important: handle this unmounted grating with care to avoid damage. Lead time: 45 weeks from order. We do not sell
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.7 ★★★★★
Based on 2426 reviews
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Product Reviews
★★★★★ 5
Just as described
Color: Blue+red
Just as described. Quick shipping
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026
★★★★★ 3
Leaks
Color: Blue+red
Water leaks out of the button you press to change out the head so we will be sending back. Other than that it would be perfect, I’m sure it’s just a fluke thing.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Almost Perfect
Color: Pink+purple
EDITED TO ADD: the seller reached out after I left this review and told me the heads are replaceable! Mine didn't come with extra heads and I didn't realize they came off. Thank for reaching out! It looks like the product even comes with replacement heads now and you can also buy them separately. Perfect! These are great.
_________
My kids love these toothbrushes and I love that they're rechargeable without needing batteries. However, the charging feature is almost completely negated by the fact that you can't replace the heads! It would be a 5 star if you could swap those out.
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Reviewed in the United States on April 16, 2026
★★★★★ 5
Very cute and effective!
Color: Pink+purple, Color: Pink+purple
Very cute and effective brush! I love that there are different settings for different ages and the lowest is soft enough for my 3 year old. She LOVED choosing from the stickers to put on and there’s more left over for when she wants to change them. Stays charged for quite a long time. Would repurchase!
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Perfect kids electric toothbrush
Color: Pink+purple
My child loves this toothbrush. I love that it’s rechargeable and comes with extra brush heads. Very suitable for kids and a great value.
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Reviewed in the United States on April 1, 2026
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