To realized the design life of the probe, it is recommended that you try to limit sample temperatures to less than 60 C if possible. Using the probes above 60 C reduces the useful life. Solvents such as acetone, toluene, methylene chloride, etc., may damage the chemical-resistant epoxy at the probe tip with extended use. Then rinse the electrode well with deionized water. Use bleach solution as described above.
All meters have a membrane keypad and are water-resistant, i.e. splashes and wet hands.
The handheld field meter carries an IP rating of 65. The probes are manufactured from 316-grade stainless steel and resist corrosion, bending and breaking. The micro probes require an approximate 2mm immersion depth to obtain a reading. An interesting, non-published fact, however, is that the sensor and the reference junction on the general purpose slant tip probe is recessed an approximate 1mm into the chemical resistant resin so as to prevent surface abrasion. You can actually obtain a reading on a single drop of fluid by dropping it into this well, covering both the sensor and the reference junction.