EXHIBIT 1

May 30, 2018

IDB DEVELOPMENT CORPORATION LTD.3 Azrieli Center Triangular Tower 44^th floor

Tel Aviv 6602301

Israel

Gentlemen,

Pursuant to Rule 13d-1(k)(1)(iii) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agrees that IDB DEVELOPMENT CORPORATION LTD.(“IDB”) may file as necessary on behalf of the undersigned with the Securities and Exchange Commission a Schedule 13G or Schedule 13D and any amendments thereto in respect of shares of NOVA MEASURING INSTRUMENTS LTD. purchased, owned or sold from time to time by the undersigned.

IDB is hereby authorized to file a copy of this letter as an exhibit to said Schedule 13D or Schedule 13G or any amendments thereto.

Very truly yours,

____________________________

EDUARDO SERGIO ELSZTAIN

Agreed:

______________________________________________

IDB DEVELOPMENT CORPORATION LTD.Name:

By: /s/ Sholem Lapidot          /s/ Aaron Kaufman

     Name: Sholem Lapidot, Aaron Kaufman

     Title: CEO; VP & General Counsel