Using Fluke 741/744 instead of standard references

[klim]

Hi, i got cheap Fluke 741 and 744 and asking myself if it can be used as reliable replacement for standard references like DMMCheckPlus or others.
I know Fluke is missing some sources, like: AC Voltage, AC Current but what do you think about?

Specification Fluke 744 as Source Accuracy
Voltage DC   110.000 mV   0.01%+0.005% *
1.10000 V   0.01%+0.005% *
15.0000 V   0.01%+0.005% *
Current DC   22.000 mA (Source)   0.01%+ 0.015% *
22.000 mA (Simulate)   0.02% + 0.03% *
Resistance   11.000 Ω   0.01% + 20 mΩ
110.00 Ω   0.01% + 40 mΩ
1.1000 kΩ   0.02% + 500 mΩ
11.000 kΩ   0.03% + 5Ω
Frequency   0.00 to 10.99 Hz   0.01 Hz
11.00 to 109.99 Hz   0.1 Hz
110.0 to 1099.9 Hz   0.1 Hz
1100 to 21999 Hz   2 Hz
22.000 to 50.000 kHz   5 Hz


DMMCheckPlus
Resistance : Four 0.1%, 10ppm precision resistors are included: 100Ω, 1.00KΩ, 10.00KΩ, and 100.0KΩ
DC voltage : 5V, ± 0.007% voltage reference
DC current : 1mA, ±0.1% current source
AC voltage : 5V RMS, bipolar (+5V, -5V) square wave, ±0.1% voltage source
AC current : 1mA RMS, ±0.2% current source
Frequency : 100Hz, ±0.02% signal source
Duty Cycle : 100Hz, 5V RMS, signal source has 50% ± 0.05% duty cycle