Triumph-Adler LS828

Serial number None
Accessories Protective plastic cover
Condition Good. The front is pretty nice. The back and the plastic cover are quite worn, the battery compartment is rather dirty and the battery contacts are corroded. However, the unit works just fine.
Repairs, Comments
Acquired 7.11.2003
Type, Precision, Input mode Scientific, 8 BCD digits, exponent ±99, Algebraic
Programmable No
Memory 1 summation register, not permanent
Display 9 digit 7 segment black&white LCD plus annunciators. Shared by mantissa and exponent.
Special features Some statistics functions are not explicitly indicated by key labels but are shown on a sticker inside the plastic cover.
Original Pricing, Production
Batteries 2xAA, no external power supply
Dimensions Length 13.9cm, Width 7.1cm, Height 2.5cm
Comment The "MODE" key switches between DEG, RAD,  nd GRAD.
The SUM key adds values to the summation registers and displays the number of values entered so far. It is unclear how the summation registers can be cleared other than by turning the unit off.
Inside the plastic cover the function of the red "INV" key are described:
INV SUM DELETE Remove value from summation registers.
INV sin, cos, tan arcsin, arccos, artan Inverse trig functions.
INV MR sigma Standard deviation of SUM values.
INV STO mean Mean of SUM values.
INV M+ variance Variance of SUM values.
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