I bought a couple of these units off of Ebay - SamLove from China. These units use the ATMEGA328P-PU in the long DIP form. They do not have the 2.5V voltage reference on Pin 27, but they do have the 8 Mhz crystal and the bypass caps.
I did a test, right out of the box, and here is the results, with no calibration;
47pF 5% Mica 55pF 52pF
150pF 5% Mica 162pF 161pF
300pF 10% Mica 323pF 322pF
470pF 10% Mica 470pF 459pF
560pF 5% Mica 574pF 571pF
3000pf 2% Mica 3062pF 3040pF
4300pF 1% Mica 4392pF 4369pF
8200pf 1% Mica 8394pF 8347pF
11000pf 5% Mica 10.67nF 10.62nF
17000pF 2% Mica 17.27nF 17.17nF
.00604uF 3% 6060pF 6025pF
.00301uF 3% 3151pF 3136pF
.0243uF 3% 25.09nF 24.62nF
.0478uF 3% 48.31nF 47.44nF
.075uF 1% 75.98nF 75.5nF
.0768uF 1% 78.14nF 77.70nF
.183uF 2% 185.1nF 1.6o 182.2nF 1.2o
1.0uF 10% 1112nF .42o 1106nF .42o
1uF Tant 1051nF 4.3o .5% 1038nF 5.7o .6%
2uF Mylar 2216nF .25o 2203nF .24o
3uF Mylar 3143nF .22o 3124nF .21o
4uF Mylar 4151nF .22o 4127nF .21o
10uF Tant diode 3.57V 11.5uF diode 3.92V 11.2uF
1uF Mil Glass 990.1nF .91o .1% 979.3nF .89o .1%
100uF Electro 100.2uF .52o .4% 97.43uF .51o .5%
234uf 10% NP Aluminum Electro 230.9uF .23ohm 1.0% 223.7uF .21o 1.2%
470uF Electro 544.ouF .24o .5% 529.8uF .34o .7%
2000uF Electro 2154uF .2o .6% 2096uF .18o .6%
3300uF 3318uF .19o 1.5% 3249uF .21o 1.3%
8000uF Electro 8999uF .22o .6% 8779uF .20o .6%
10,000uF Electro 11.67mF .20o 1.6% 11.38mF .16o 1.6%
10uH .5o .01mH .4o .01mH
100uH 1.5o .09mH 1.6o .09mH
2.5mH 20.0o 2.64mH 19.7o 2.61mH
30mH 3.1o 29.8mH 3.2o 30.1mH
44mH 55.7o 40.8mH 56.7o 40.5mH
50mH 46.7o 50.8mH 47.5o 50.8mH
120mH 158.8o 122mH 159.6o 123mH
250mH 32.8o 248mH 33.5o 247mH
720mH 44.3o 703mH 45.0o 701mH
2.3H 62.3o 7.46H 63.5o 7.75H
zero ohm .1% decade .28o .27o
.5 ohm decade .66o .79o
1 ohm decade 1.28o 1.31o
5 ohm decade 5.34o 5.51o
10 ohm decade 10.5o 10.7o
50 ohm decade 50.8o 51.7o
100 ohm decade 101.2o 103.1o
500 ohm decade 498.8o 499.2o
1K decade 1003o 1003o
5K decade 4957o 4888o
10K decade 9955o 9786o
40K decade 40.57K 41.30K
10K .1$ MF 9786o 9962o
162K .1% MF 161.8K 162.0K
300K .1% MF 300.2K 300.3K
499K .1% MF 499.2K 499.6K
100 ohm .05% WW 101.1o 102.9o
1K .01% WW 1003o 1003o
10K .01% WW 9955o 9788o
100K .01% WW 101.2K 103.0K
1M .01% WW 1002K 1002K
9M 1% WW 9215K 9032K
RS2761067 SCR 200V 6A NPN transistor....
2N3440 B99 595mV B100 663mV
2N3906 B190 674mV B186 748mV
2N5415 B72 660mV B70 659mV
IFR820 FET N E MOS C958pf V+3.31V c941pF 3.33V
MPF102 FET N JFET 2.7mA gs 1.87 2.7mA gs1.89
1N4146 709mV 10pF 787mV 9pF
1N5400 604mV 84pF 642mV 82pF
1N6263 573mV 8pF 586mV 8pF
MBR10H100CT 363mV 363mV 369mV 369mV