Home - Keystone Instruments

Welcome to the testoverse
of measuring instruments

You can choose from our diverse products, suitable to your needs.

All products online are available for immediate purchase.

All products are locally service and carry factory warranty.

If you’re in the food business, you know how important it is to monitor and maintain proper temperatures for your products. The testo 174T data

Compact precision for your jobs. testo’s new digital HVAC measuring instruments are always there when you need accurate reading fast.