Check the listing for details. Texas Instruments TI-36X Pro Scientific Calculator. Condition: New. Listed at 19.99 USD. The Texas Instruments TI-36X Pro Scientific Calculator is a handheld device known for its regular key size and scientific capabilities. As part of the Texas Instruments brand, it is designed to provide accurate calculations and functions for various mathematical and scientific purposes. The model, TI-36X Pro, is a reliable choice for professionals, students, and anyone in need of a dependable calculator for their office or educational needs. Its compact size makes it convenient to carry around and use on-the-go.The Texas Instruments TI-36X Pro Scientific Calculator is a handheld device known for its regular key size and scientific capabilities. As part of the Texas Instruments brand, it is designed to provide accurate calculations and functions for various mathematical and scientific purposes. The model, TI-36X Pro, is a reliable choice for professionals, students, and anyone in need of a dependable calculator for their office or educational needs. Its compact size makes it convenient to carry around and use on-the-go.