SKU: 50910940447

GOYOJO GSR720 Surface Roughness Tester - 0.001μm

$296.55 $329.50
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Ships within 48 hours · Estimated delivery Oct 10 - Oct 15

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Description

GOYOJO GSR720 Surface Roughness Tester - 0.001μmHow It Works: When measuring surface roughness, the GOYOJO Surface Roughness Tester places the sensor on the surface and then uniformly slides it along the surface using the internal mechanism. The sensor captures surface roughness with its sharp built in probe. This roughness causes displacement in the probe, leading to a change in the induction quantity of the induction coil, thereby generating an analog signal proportional to the surface roughness

How It Works:

When measuring surface roughness, the GOYOJO Surface Roughness Tester places the sensor on the surface and then uniformly slides it along the surface using the internal mechanism. The sensor captures surface roughness with its sharp built-in probe. This roughness causes displacement in the probe, leading to a change in the induction quantity of the induction coil, thereby generating an analog signal proportional to the surface roughness at the output of the phase-sensitive rectifier.

Specifications:

Display Resolution 0.001μm
Measurement Range: Ra 0.025-12.5μm
Ra, Rq 0.005-16μm
Rz, Ry, Rt, Rp, Rv, Rmax, R3z 0.02-160μm
RS, RSm 1mm
Rr 0-100% (9%Rt)
Rsk 0-100%
Range Options ±20μm, ±40μm, ±80μm
Filters RC, PC-RC, GAUSS, D-P
Sampling Lengths 0.25mm, 0.8mm, 2.5mm
Maximum Drive Travel 17.5mm (0.7 inches)
Minimum Drive Travel 1.3mm (0.052 inches)
Indication Error ≤10%
Variability in Indication ≤6%

Specifications:

Display 128X640 LED Dot Matrix (Self-illuminating)
External Interface USB
Power Source Built-in rechargeable lithium-ion battery or external power adapter
Dimensions 140 x 52 x 48(5.51 x 2.05 x 1.89 inches)
Weight 440g(0.97 pounds)

Sensor Performance Specifications:

Detection Principle Inductive
Probe Contact Force 4mN (0.4gf)
Probe Angle 90°
Probe Tip Radius 5μm
Guide Longitudinal Radius 45mm
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 50910940447

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4.7 ★★★★★
Based on 28 reviews
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G
Verified Purchase
gigglelish
Lowell, US
★★★★★ 5
Good
Size: 1 Ounce (Pack of 1)
Feels great and moisturizing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
M
Verified Purchase
Mo
Natrona Heights, US
★★★★★ 5
Not an eye cream, but makes a great eye cream
I use this as any eye cream before applying my prescription tretinoin cream. Its provides a good barrier for my sensitive eye area without feeling heavy. Its large so it is a great value for my money. It is light weight, not greasy, unscented, and is great for my sensitive skin. I am prone to millia and haven't had any issues since switching to this for eye cream.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 14, 2026
B
Verified Purchase
Brittney Todd
New York, US
★★★★★ 5
Everyday light weight face moisturizer
This is the perfect moisturizer! It is light weight and it doesn’t take but a pea size amount so it last forever! This has my skin feeling so moisture and the consistency can’t beat anything. It has the best ingredients and has no fragrance which is perfect for your skin. HIGHLY RECOMMEND
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2026
M
Verified Purchase
MelRO
Whiting, US
★★★★★ 4
Great product, but received older tube
Prequel is one of my favorite skincare brands, I have always loved this particular product and usually order on the brands official website. But I needed a new tube of this quickly so I ordered here on Amazon. I recieved a tube that expires in only 4 months. I’m not sure if they sell old stock through Amazon or what the issue is. I ordered a tube straight from prequel’s website afterwards and the expiration date isn’t until January of next year. Not a huge deal, but still kind of a bummer. I will not be ordering skincare products from Amazon anymore.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
R
Verified Purchase
Ros
Carnegie, US
★★★★★ 5
Love it
My face was so dry it burned when I put my regular moisturizer on it so I got this to help. Within a few days my skin felt amazing, smooth, and not dry. It’s not thick and layers nicely if you want to. Love this stuff!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026

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