Rechargeable & Solar power scientific calculator, multi-view 6-line display with erasable LCD writing tablet for high school college graduate students and researchers.

Upgraded 991ES Plus calculators, ROATEE calculator multi-view 4-line display with erasable LCD writing tablet, solar battery power for school and business.

4 calculation modes & 240 calculation functions, including general math, statistics and regression calculations, scientific functions, scientific computation and it has memory function calculation more user-friendly.

Over 200 engineering functions for construction math and material estimation. Come with a 6 inch flip-page writing pad. Ideal for builders, carpenters, concrete workers, contractors and DIY home renovators, roofers, architects, interior decorators, construction estimators, engineering students, etc.

12-digit display and punctuation symbols, plastic buttons are more sensitive and precise than silicone key.

Calculator Writing board combines a calculator with a writing board, it has a wide range of applications to meet a variety of needs. The lcd handwriting board life is 50,000 times.