GemRed 82305 Digital Angle Finder GemRed Protractor Stainless steel 7inch 200mm (Black Button)
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Availability:
Only 10 left in stock, order soon!
Arrives
Wednesday, Jul 8
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Material Type: Stainless Steel
Features
- PATENTED MEASURING TECHNOLOGY -- Ruler and protractor combination for easy measuring inside and outside angles.
- DURABLE RULERS -- Well-made stainless steel rulers and laser etched measurements offer clear reading and years' usage.
- HIGH ACCURACY -- Accuracy of this protractor is 0.3 degree. It is a good choice for most projects like woodworking, crown molding and daily use. Folded length: about 7.5 inch/220mm.Total length 400mm.
- LOCKING FUNCTION -- For read it easily, GemRed angle finder could be locked at any angle. *NO REVERSE ANGLE/DISPLAY FUNCTION.
- BATTERY -- CR2032 battery. Package contains battery.
Features
- PATENTED MEASURING TECHNOLOGY -- Ruler and protractor combination for easy measuring inside and outside angles.
- DURABLE RULERS -- Well-made stainless steel rulers and laser etched measurements offer clear reading and years' usage.
- HIGH ACCURACY -- Accuracy of this protractor is 0.3 degree. It is a good choice for most projects like woodworking, crown molding and daily use. Folded length: about 7.5 inch/220mm.Total length 400mm.
- LOCKING FUNCTION -- For read it easily, GemRed angle finder could be locked at any angle. *NO REVERSE ANGLE/DISPLAY FUNCTION.
- BATTERY -- CR2032 battery. Package contains battery.
Material: Stainless Steel
Brand: GemRed
Color: Black Button
Product Dimensions: 8.58"L x 0.79"W
Manufacturer: Guilin GemRed Sensor Technology Co., Ltd
Part Number: 82305-200D
Item Weight: 7 ounces
Product Dimensions: 8.58 x 0.79 x 0.01 inches
Country of Origin: China
Item model number: 82305
Batteries: 1 Lithium Metal batteries required. (included)
Is Discontinued By Manufacturer: No
Size: 200mm
Color: Black Button
Material: Stainless Steel
Power Source: Battery Powered
Item Package Quantity: 1
Included Components: Battery
Batteries Included?: Yes
Batteries Required?: Yes
Battery Cell Type: Lithium
Description Pile: CR2032
Date First Available: April 14, 2015
Manufacturer: Guilin GemRed Sensor Technology Co., Ltd
Part Number: 82305-200D
Item Weight: 7 ounces
Product Dimensions: 15.75 x 0.79 x 0.1 inches
Item model number: 82305
Batteries: 1 Lithium Metal batteries required. (included)
Is Discontinued By Manufacturer: No
Size: 200mm
Color: Black Button
Style: Modern
Material: Stainless Steel
Power Source: Battery Powered
Item Package Quantity: 1
Included Components: Battery
Batteries Included?: Yes
Batteries Required?: Yes
Battery Cell Type: Lithium
Description Pile: CR2032
Date First Available: September 13, 2015
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Jul 8
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Material Type: Stainless Steel
This worked wonders when putting up baseboard. I put all new baseboard in about 1,200 sf and it made the angle cuts so easy. Highly recommend.
Reviewed in the United States on May 6, 2026 by Kristen Luton
Material Type: Stainless Steel
Well madecand seems accurate
Reviewed in the United States on April 26, 2026 by Dennis Sanford
Material Type: Stainless Steel
I run a 20 foot press brake for a living. That is, everything I do is all about the angles. I've had all sorts of different protractors over the years, from Sterrett to Mitutoyo and five or six others. My good protractor is a Sterrett cast iron job from a combination square set I bought for a couple hundred bucks. I use both the tri-square, and the protractor every hour of every day. But this thing, cheap as it is, blows them out of the water like a nuclear torpedo. Seriously, this has cut in half or more the amount of time I spend checking angles. It's accuracy is decent (certainly within the 1/2 degree shop tolerance we have) and it is extremely easy to use. The digital readout is easy to read, which is a blessing for my poor worn out eyes. (I can barely read my old Sterritt without reading glasses, which I can't wear while running my machine. So I was constantly switching glasses. Yeah, I have bifocal safety glasses, but they're a pain to use when running my machine.) But there are some down sides. Down sides I will happily live with. First, this thing is very cheaply made. In my environment I don't expect it to out-last the batteries. This is okay. For the price and the amount of time I save using it, I'll just buy another one! but it is a downside. Second, the battery is prone to falling out. Unlike some other devices, you can't easily tape the battery compartment closed either. But oh well. It doesn't fall ALL the way out, just enough where it shuts off. Push the tray in and all is well. Third, it doesn't remember it's zero after it self-shuts off. No big deal, but if you leave it sit at a particular angle over lunch when you come back it will have set that angle to zero. Easy enough to fix, but a mild irritation. All these irritants aside, this is a great product for the price. It works wonders. The only reason I don't give it five stars is for the three above reasons, and I almost did anyway. If someone would make pretty much exactly this, but with a little sturdier blades and a higher quality mechanism, I'd marry it. (Note: I work in a heavy industrial job shop, the majority of the time bending 3/8 to 1/2 plate. I also bend up to 1.25 plate, and down to 11ga on occasion. All of it up to 20 feet long. When you need to go down a length of 3/16 plate 20 feet long and check for angle consistency, this has been the best solution I've ever had. Bar none.)
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Reviewed in the United States on November 23, 2016 by Douglas Patton
Material Type: Stainless Steel
I like doing pro's and con's to a review so will just dive into it. Pro's This thing is STURDY!! I did not expect it to be as sturdy as it is!! I expected the rulers to be flimsy Easy to use! Zero out on the surface you are going to measure by pressing one button! Easy to read!! Even for my old eyes! The tighten device does not move the angle finder thus screwing up your measurement. Comes with a extra battery! Instructions are easy to follow! Price!! Con's -- These are more a personal preference and do not really distract from the Digital Angle Finder itself Would be nice to have a lighted readout feature. Made in China. All-in-all, I highly recommend this item, despite my 2 con's.
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Reviewed in the United States on September 16, 2025 by John A Waclawski
Material Type: Stainless Steel
This is a great little device. Love the simplicity and accuracy. It serves its purpose well.
Reviewed in the United States on March 4, 2026 by HDD
Material Type: Stainless Steel
Don't let the title fool you. I'm not being snarky, these are both 100% true. The caliper is heavy, functions very well and I am impressed with how the pivot tightness can be adjusted. I've had several of this type before and they've always simply screwed down to tighten and back to loosen. This one does something similar but ... not. I've only owned it for a short time but I've validated its accuracy as best I am able with the known square edges I've got and it hasn't failed yet. I will agree with the description: The corners are sharp - don't underestimate that fact.
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Reviewed in the United States on September 20, 2025 by John H.
Material Type: Stainless Steel
Awesome Product. No issues. Would buy again. Makes angles easy.
Reviewed in the United States on February 26, 2026 by jksii91
Material Type: Stainless Steel
I compared two Digital Protractor Angle Finders: GemRed (2 black button version) & "S&F STEAD & FAST". I was hoping for a clear winner to make my decision easy, but I did not get that. Commonalities: Both brands are made in China, use the same battery, & are the same length (400mm, ~15.75 inch when fully opened), same width, same thickness. They both keep the battery in a no-tools-needed, easy to open "drawer" so it's easy to remove the battery to prevent battery drain during storage. I won't be using this every day or even every week, so this feature is important to me. Build Quality: Both rulers are SS (Stainless Steel), but they are different types of SS. The S&F is attracted to magnets and the GemRad is not. (There are over 50 types of SS & some are attracted to magnets.) Since they don't say what types of SS they are, I give the edge to the non-magnetic GemRad. The S&F has thicker sturdier plastic (especially the battery drawer). The GemRed drawer opens a bit too easily (if jolted, the drawer can open & the battery can disconnect). The S&F battery drawer opens stiffly. Finding Angles: As it should be, the GemRed angle ruler is easy to move when the lock knob is loose and it gets stiffer as the knob is tightened. The S&F however, is stiff to move no matter how loose the knob is. That would be a disadvantage when I'm measuring angles of things that flex when I push on them. Turning the S&F knob very tight makes in only a tiny bit stiffer. Ruler: The S&F ruler markings are darker & much easier to read. The metric markings on both brands go from 0 to 400mm. As you might expect, the S&F inch markings go from 0 to 15 & 16/32. Inexplicably, the GemRad imperial markings go from 0 to 7 inches, twice (instead of a continuous 0 to 15.5")! IMO, GemRad fell down on that one. Buttons: A quick press of the GenRad [On/Off] button only turns off the display, while the rest of the electronics continues to invisibly waste the battery (unless I remember to hold the button for 3 seconds). I don't like that. The S&F has 3 buttons & more functionality than the GemRad. The S&F has a [Hold] button, which could be handy in a situation where I can't see the display while measuring some angle. The S&F also has a button to display in degrees & minutes, instead of decimal degrees, but I doubt I'd ever use that feature myself. (The GenRad has some "hints" on their instruction sheet. One is "Never leave it outside in a wet and shiny environment." Another is "Do not use as a weapon to hit people." That seems like good advice -- a rock would make a better weapon.) I went back and forth about which one is better for me. The S&F is better than the GemRad in so many ways; however, I could not get past the S&F angle measure stiffness and non-functional lock knob. Since I plan to use it mainly to measure angles (not as a ruler), the GemRad is slightly better for me. I'll have to remember to use the battery door as my On/Off switch.
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Reviewed in the United States on July 10, 2024 by Judge Mental