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DoubleCheck - Talking calculator

With DoubleCheck, the talking calculator, you can not only calculate in the four basic arithmetic operations, but also calculate percentages, squares, powers, square roots, and save or add values to the saved value. This makes DoubleCheck a full-fledged commercial calculator that can also be used to calculate compound interest, present value and annuities. DoubleCheck also offers a conversion mode: with just a few keystrokes you can easily convert the usual units of measurement for volumes, length, weight, temperature or even currencies. Doublecheck also says and displays time and date if required.

The large, easy-to-feel keys are separated from each other and are also clearly labelled. The values entered are shown on the 10-digit display and are output in clear, natural language. The calculation result is announced either as a whole number or in individual digits. DoubleCheck offers 6 volume levels (including silent), headphones can be connected if required. The automatic switch-off function helps to save energy and the key lock prevents DoubleCheck from being activated unintentionally, for example during transport. A mains adapter is optionally available!


  • 10 memory locations
  • Reciprocal value
  • Percentage calculation
  • Squaring, exponentiating and drawing a root
  • Calculate compound interest, present value and annuities
  • Conversion of currency, temperature, volumes, length and weight
  • Date and time with alarm function
  • Key lock

Technical data

  • Commercial calculator
  • Dimensions: 154 x (13-21) x 64 mm
  • 6 volume levels
  • Connection socket for earphones
  • Weight: 125 g (including batteries)
  • Power supply: 2 x 1.5V AAA batteries
  • 10-digit LCD display (7 mm)
  • Key lock
  • Colour: blue/white

Scope of delivery

  • 1 DoubleCheck calculator (incl. batteries), 1 operating manual in black letters and on CD

Operating instructions for Double Check in German