Welcome to the testoverse
of measuring instruments

FEATURED PRODUCTS

WHAT's NEW?

The new testo 16x series wifi data loggers

Testo launches a new innovative product, the testo 565i vacuum pump, which enables fully automatic

The new thermal imager for smartphones

With the new testo 860i, Testo presents an innovative,

Testo bluetooth food line

With the market launch of the Food BT line, measurement technology specialist

Save time. Cut cost with testo 174 mini data logger

With the market launch of the new testo 174 mini data loggers, measurement

Authorized Distributor

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.