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Revolutionizing the Financial Sector Since 1912

Our story

How we got our start?

As the inventor of the first commercial calculator in 1912, Monroe has earned the trust of Fortune 500 companies, non-profit organizations and government agencies, including the likes of NASA. Our products have landed on major television networks and hit series, including the show Madmen.

What makes our product unique?

Our calculators are known industry-wide as the top-of-the-line calculator on the market today. We have built our reputation on outstanding quality and service. When you need us, we are here for you.

Why we love what we do?

Despite being a 100+ year-old company, we treat it as a startup. Our products have withstood the test of time, but we are constantly looking for new ways to innovate. We focus on making the jobs and lives of our customers just a little bit easier and a little bit more enjoyable.

Product Description

The Monroe Difference

As the inventor of the commercial printing calculator in 1912, Monroe has earned the trust of Fortune 500 companies, non-profit organizations and government agencies, including the likes of NASA. Even Hollywood has recognized the strength of the Monroe brand as its products have landed on major television networks and hit series including the show Madmen. Monroe Systems for Business are forerunners in producing technology tools that empower businesses, schools, and individuals to succeed. Headquartered in Pennsylvania, Monroe has a continued commitment to creating durable and reliable products, along with providing superior customer support known as ‘The Monroe Spirit'.

Monroe Systems for Business Ultimate X Features

Velvet touch keys with individual key switch technology
Ability to edit and reprint tapes and entries up to 99 lines
Print speed of 5 lines per second
Slide switch to select running subtotal or grand total
Enclosed paper roll to protect from dust build up
Indicator lamp (making users aware of an active calculation)
Automatic total print above tear-off off knife
Hidden storage compartment for a spare paper roll and a twin-spooled ribbon to reduce downtime
(2) 4-key independent memories that will allow users to simultaneously run multiple math problems, all while having the ability to store their respective tax rates.
Independent operation of multiplication and division capability, enabling the user to multiply and divide during addition and subtraction.


	8130X	8145X	UltimateX
Print Speed	5 lines/second	5 lines/second	5 lines/second
Type of Calculator	Heavy-Duty	Heavy-Duty	Heavy-Duty
Independent (4) Key Memories	1	2	2
Decimal Selections	+,F,0,1,2,3,4,6	+,F,0,1,2,3,4,6	+,F,0,1,2,3,4,6
Display and Print Screen	12-digit	14-digit	12-digit
Tax with Tax+ and Tax-	?	?	?
Cupped Keys	?	?	?
Grand Total/Accumulator Lamp (Exclusive Monroe Feature)	?	?	?
Two Column Addition (Exclusive Monroe Feature)	?	?	?
Enclosed Paper Roll and Internal Storage for Paper Roll (Exclusive Monroe Feature)	?	?	?

How to Install Monroe Paper Rolls into a Monroe Printing Calculator


Step 1 Turn OFF the calculator. Slide the printer cover off of the device. Put pressure on the cover at the top of the device, pushing off the cover. Take note of the arms holding the paper roll in place. You’ll need to remove the paper roll core from the previous roll that you are replacing for a new paper roll.	Step 2 Install the new paper roll. Make sure that the paper sits so the paper is feeding up towards the sky and not down toward the ground. This will help keep the paper curling toward the back of the machine when you print.	Step 3 Now it is time to feed the printer paper into the printer. Look for a slot along the top-rear of the printer. Then, feed the paper between the slot in the printer. Turn ON the calculator. Press the “FEED” button on the printer so the paper continues to be fed through the device properly.

How to Install the Monroe M33X Ribbon Cartridge into a Monroe Printing Calculator


Step 1 Turn OFF the calculator. Remove the printer cover. Remove paper from printer using the paper advance key. Remove the new cartridge from the packaging, making sure to leave the ribbon lock in place to stabilize the ribbon during installation and make the process easier.	Step 2 Install the right hand ribbon arm (Arm “A”) first and pivot the cartridge to engage the printer guide arm having it seated under metal tab “C”. The left hand ribbon arm (Arm “B”) must be moved to the left to clear and engage the printer guide arm on the left hand side.	Step 3 The rear body of the cartridge can now be pressed down to engage the printer spools and the ribbon lock will be disengaged from the cartridge and can now be disposed of. Helpful Hint: If the back of the ribbon cartridge does not engage with the printer spools, turn the wheels on top of the cartridge to engage the cartridge pins with the holes in the printer spools.


		Monroe Foam Wedge	Monroe Paper Rolls	Monroe M33X Ribbon
Description		Universally Sized Foam Calculator Stand For Heavy-Duty Printing Calculators	The only 20 lb. 2 ¼" X 150' Single-Ply Bond Paper Rolls on the Market	Offers Monroe's Exclusive True Red Color, Heaviest Inking Saturation on the Market