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 
Links 

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 EXP 
CN 
? 
INV MR 
sigma 
Standard deviation of SUM values. 
INV STO 
mean 
Mean of SUM values. 
INV M+ 
variance 
Variance of SUM values. 
