The Casio MJ-100Da is a 150 steps check and correct desktop calculator with tax and GT keys and on display indication of active constant. It has a number of features that make it ideal for everyday use, including:

150 steps check: The calculator can store up to 150 previous calculation steps, so you can easily check your work.
Tax calculation: The calculator has dedicated keys for calculating taxes, making it easy to add sales tax or other taxes to your calculations.
GT keys: The calculator has dedicated keys for calculating grand totals, making it easy to keep track of your expenses.
On display indication of active constant: The calculator displays the active constant on the display, so you can easily see what value is being used in your calculations.
The Casio MJ-100Da is also made with high-quality materials and features a number of durability features, including:

UV-coated durable keys: The keys are coated with UV-resistant ink to prevent them from fading or becoming unreadable.
Key rollover: Key operations are stored in a buffer, so nothing is lost even during high-speed input.
Double zero key: The double zero key allows you to enter two zeros with a single press of the key.
Shift key: The shift key allows you to access additional functions.
Overall, the Casio MJ-100Da is a great choice for anyone looking for a durable and functional calculator with a number of features that make it ideal for everyday use.

Here are some of the pros and cons of the Casio MJ-100Da:

Pros:

150 steps check
Tax calculation
GT keys
On display indication of active constant
UV-coated durable keys
Key rollover
Double zero key
Shift key
Cons:

No scientific functions
No graphing functions
No backlight
The Casio MJ-100Da is a great choice for anyone looking for a basic calculator with a number of features that make it ideal for everyday use. It is durable and functional, and it has a number of features that make it easy to use