Prinztronic 99P.

6 v (4x AA batteries).

Display is 8 digits, green fluorescent in single tube.

4 functions, %.

88 mm x 137 mm x 26 mm (3.5" x 5.5" x 1").

Made in Japan.
The distinctive style casing with the rounded corners on the right side is a feature of some models from the TEAL (Tokyo Electronic Applications Laboratory Ltd.) company, so this model may have been manufactured by TEAL.