Is it safe to use the probe if the dielectric fluid container is empty?

Is it safe to use the probe if the dielectric fluid container is empty?

Yes, but the Max voltage rating is reduced to 13 kV, dc to 2 Mhz. Refer to Figure 1-2 in the user manual for frequencies above 2 Mhz.

However, even a very small amount of liquid remaining is sufficient to operate at full specification, since it is the vapor that provides the insulating properties.