The unit of the capacitance is Farad, abbreviated as F. But F is usually too big to use in electronics, so the micro F, F and pico F, pF are often used. 1 F=0.000001 F, and  1 pF = 0.000001 F.

The capacitance of a capacitor is indicated as a value in F or in pF. The number in pF is usually too long, so a 3-digits annotation is used. The first two digits represent a two-digit number, and the third digit is the number of zeros to be added after the two-digit number. The list of the capacitors used in the FET Mic DIY kit are:

Symbol
Value on the Schematics
Numbers on the Capacitor

C1
0.01F 103 ( = 10 000pF = 0.01F)
C2
1000P 102 ( = 10 00pF)
C3
220p 221 ( = 22 0pF)
C4
22/16V
22 ||, 16+

C5
0.47F 474 ( = 47 0000pF = 0.47 F)
C6
0.047F 473 ( = 47 000pF = 0.047 F)
C7
6800p 682 ( = 68 00pF)
C8
4.7/35V 475, 35 ( = 47 00000pF = 4.7 F), 35V

C10, C11
330p 331 ( = 33 0pF)
C12
6.8/40V 685, 35+ ( = 68 00000pF = 6.8 F), 35V

C13, C14
2.2/50V 225, 50+ ( = 22 00000pF = 2.2 F), 50V
CF
150P
151 ( = 15 0pF)





You may see some capacitors show a voltage value, but some not. Either shown or not, this parameter is a very important one. This is the highest DC voltage under which the capacitor is allowed to work properly. If you put a capacitor with a low voltage rating in a place on PCB with a higher voltage, the capacitor will mostly be damaged.