TMX2G General Purpose Probe, 15ft / 4.5m lead, Probe Type: Surface / Air / Liquids. Common uses are copper pipe, ambient air, RH wet-sock method. Response time is 6 seconds. Temperature Range of -40˚F to 257˚F / -40˚C TO +125˚C. TM150, TM250, TM350, TM360 & SH450 Series.