Testo instruments and Testo meters are used in the following sectors: HVAC-R: heating, ventilation, air conditioning, refrigeration, and process industries. We are an authorised UK distributor and supplier of Testo instruments. The Testo instrument range of measurement parameters include: temperature, humidity, vacuum, velocity, air flow, compressed air measurement, gas analysis, rpm, pressure, sound, light, pH, and thermal imaging cameras. If you need a Testo instrument that you cannot find on the site contact us at 0113 2489966 and we will try and help.