Double Check

Double Check is an advanced talking calculator that offers basic arithmetic functions along with the ability to calculate percentages, squares, powers and square roots, as well as store and add values to the memory bank. This financial calculator combines commercial and conversion functions in one device, allowing users to easily calculate complex financial metrics like compound interest, present value and annuities.

Double Check’s versatile conversion mode allows users to seamlessly switch between different units of measurement for volume, length, weight, temperature and even currencies. With just a few keystrokes, Double Check simplifies the conversion process, providing a quick and efficient solution to everyday measurement challenges.

Designed specifically for visually impaired users, Double Check provides clear voice output with six adjustable volume levels. In addition to its calculator features, it can also speak and display the time and date on demand, making it a versatile tool for everyday use.

Key Features:

• 6 volume levels
• Key lock function
• 10 memory locations
• Percentage, squaring, root and exponent calculations
• Reciprocal function
• Compound interest, present value and annuity calculations
• Currency, temperature, volume, length and weight conversions
• Spoken date, time and alarm functions
• 10-digit LCD display (7 mm)
• Headphone connection: 3.5 mm jack
• Power: 2 x AAA batteries
• Dimensions: 154 x 21 x 64 mm
• Weight (with batteries): 125 g