Authorized Distributor of testo since 1991

Welcome to the testoverse
of measuring instruments

testoverse of measuring instruments

Palas AQ Guard
Leak Detectors

Testo Food Bluetooth line

Online Data Loggers

Testo 860i Thermal Imager
Testo 558s Digital Manifold

WHAT’S NEW?

Authorized Distributor

Testo HD LOGO - 2
schmidt tech
palas new logo

Authorized Dealer


Keystone Instruments has been the original distributor of Testo since 1991.


We help our clients with customized solutions and create digital food safety manuals.