IP68 waterproof probes allow temperature measurement. But here, the IP 68 waterproof rating gives you the best level of protection against dust and splashing water.
And for good reason, the European standard EN 60529 indicates the applicable levels of tightness:
The first number corresponds to protection against dust or mold. They are listed as follows:
- 0: no protection
- 1: protection against solid bodies over 50 mm
- 2: protection against solid bodies over 12,5 mm
- 3: protection against solid bodies over 2,5 mm
- 4: protection against solid bodies over 1 mm
- 5: protection against dust and microscopic residues
- 6: maximum protection
The second number corresponds to the protection against water:
- 0: no protection
- 1: protection against vertically falling water droplets
- 2: protection against drops up to 15º from the vertical of water droplets
- 3: protection against drops up to 60º from the vertical of water droplets
- 4: protection against splashing water from all directions
- 5: protection against water jets (with a flow rate of 12,5 l/min ±5%)
- 6: protection against water jets (with a flow rate of 100 l/min ±5%)
- 7: protection against temporary immersion at a depth of one meter
- 8: protection against prolonged immersion at more than 1 meter