[time-nuts] Instruments for 1PPS accuracy measurement

[jelveh_t at yahoo.com]

HiI am new to time and frequency measurements.
I want an instrument to measure and compare 1PPS stability and accuracy of different GPSDOs and GPS modules.I did not see any advice or help on the site for the instruments suitable for these type of measurements.Would you mind helping me find a list of suitable instruments? It would be appreciated if the price and lead time of each instrument is provided, as well.Thank you for helping me.