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Most battery for indicators and calipers are the SR-44 battery.
Probably the same one used in Mitutoyo Calipers
541980 Replacement Battery
Mitutoyo MyCAL Digital Caliper: Precision Tools: Light...

I have manuals for Rong Fu
RF-25
RF-30
RF-40
Also have manual for the Jet JVM-836-1
You can get them at Rong Fu Boring & Milling Machines Dovetail Column w/Geared Head: Machine Tools: Light Tool...

I would contact the mfg of the item which is Hexagon Metrology
Brown & Sharpe

Or if you are looking for any new Brown and Sharpe items I sell them at discounted prices
...

I sell SPI hole Micrometers and you are correct that they are reasonably priced


Thank you,
Michael Elson
Light Tool Supply

I can get the best prices on Mitutoyo Measuring Instruments. Email me if you don't see the Mitutoyo part# you are looking for. I have access to everytjhing

Thank you
Michael Elson
Light Tool...

I sell a hand held CNC Gcoder that might be helpful to you.

CncGcoder HD: Software: Light Tool Supply

# Eliminate Costly "DNC" Systems by Tranfering "G" Code From CNC Control to PC via PDA
#...

I also recently got my hands on a Rong Fu RF-45 manual.

I would be happy to email it to you.
Michael Elson
Light Tool Supply
http://www.lighttoolsupply.com/

Top Tech are good machines made in China. They are direct copies of the Rong Fu RF-45. We have had good luck selling them and customers seem very happy. They are in stock now for $1,395.00 at...

I have manuals for Rong Fu
RF-25
RF-30
RF-40
Also have manual for the Jet JVM-836-1
You can get them at http://www.lighttoolsupply.com/
I would be happy to email them to you.
Michael Elson...