The Teslameter FM 302 can be leased with different probes.
You get a calibrated device with calibrated probes including certificate.
Leasing price is calculated on a weekly base.
Optional Linearity Curve
Optional you can get a linearity curve for the probes.
Examples of these curves, see here: 
data sheet AS-active-probe and here Application Note PE003 Linearity Curves.
Appointment
If you have a fixed date whe you need the teslameter, we recommend you to make an appointment early.
Notice to Leasing Teslameters
Leasing devices are currently only available in Germany.