testo 830-T4 Manual De Instrucciones página 15

11.3 Measurement spot, Distance
A specific spot is determined depending on the distance from the
measuring instrument to the object being measured.
Measurement optics (Ratio Distance : Measurement spot)
testo 830-T4
12. Information on contact measurement
Observe minimum penetration depth in immersion/penetration
probes: 10 x probe diameter
Avoid applications in corrosive acids or bases.
Do not use spring-loaded surface probes on sharp edges.
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