Anyone have a HR-150A hardness tester?

I have this model. Purchased new in 1995 from Penn tool company. I use it at least once a week. It is darn accurate, and I trust it to give me repeatable numbers. I check it maybe once every 5 years against the calibration plates that came with it. It's always within tenths of them. I only use the C scale.
It's great when you have mystery steel, and want to verify if it needs to be annealed in the heat treat furnace.
I got it originally as I made some shafts for my skid loader that roller bearings run on. Oil hardening tool steel was used, and I wanted to check temper.
I used it this week as I purchased some HSS 90 degree point spotting drills from eBay. They should all be greater the Rc>65. But I found the smaller drills to be softer. I wrote the hardness on the label for each drill. The 3mm was Rc=51, the 8, 10, and 12mm drills were acceptable hardness.
 

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I have this model. Purchased new in 1995 from Penn tool company. I use it at least once a week. It is darn accurate, and I trust it to give me repeatable numbers. I check it maybe once every 5 years against the calibration plates that came with it. It's always within tenths of them. I only use the C scale.
It's great when you have mystery steel, and want to verify if it needs to be annealed in the heat treat furnace.
I got it originally as I made some shafts for my skid loader that roller bearings run on. Oil hardening tool steel was used, and I wanted to check temper.
I used it this week as I purchased some HSS 90 degree point spotting drills from eBay. They should all be greater the Rc>65. But I found the smaller drills to be softer. I wrote the hardness on the label for each drill. The 3mm was Rc=51, the 8, 10, and 12mm drills were acceptable hardness.
Is this a part for it ? I have 4.
It looks like #7 in the drawing in the back of the instruction book.
 

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This is what else I have.
 

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Is this a part for it ? I have 4.
It looks like #7 in the drawing in the back of the instruction book.
I don't think that is for this tester. Simple set screw is used to change between the Rockwell C and B test points. Otherwise the wood box of accessories has different plattens, the V is the one in my machine now, but there is a small round, and large round, and then the calibration test plates.
 
I don't think that is for this tester. Simple set screw is used to change between the Rockwell C and B test points. Otherwise the wood box of accessories has different plattens, the V is the one in my machine now, but there is a small round, and large round, and then the calibration test plates.
It looks like it might go inside, at the bottom back.
 
Mine came with this same box of accessories. If you have this without the tester, someone is missing a needed set of components.
Like I said, next time I am up there, I will look for the tester.
 
It looks like it might go inside, at the bottom back.
I have no idea what that would be for testing. I'll have to take a photo of the jack screw in mine, it has a plastic cover tube that expands as the jack is raised I assume to keep dust off the threads.20201221_215221.jpg
 
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I thought it might be this part.
From the back of the instruction pamphlet.
 

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I uploaded a photo in the previous post, so this post should generate an email notification.
 
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