Specifications:
Duralumin and galvanized steel tubes are used for the manual grain probes. These probes have no internal divisions and feature an opening system in three stages. Additionally, there are double brass tubes with similar specifications.

Design and Dimensions:
The probes have 14 openings with a total length of 2.1 meters (83 inches) and a space between slots of 13.2 cm (5.3/16 inches). Another variant has 12 openings with a length of 1.8 meters (72 inches) and an opening dimension of 2.5 cm (1 inch) by 9 cm (3.1/2 inches).

Manufacturing Details:
The probes are manufactured by GEHAKA in Brazil. The document includes a code and a design scale, but specific details are not provided.

Approval:
The design was approved on 17/04/2018 by Alexandre F.

Additional Components:
A wall bracket is mentioned, but further details are not provided.