yes I have read it, and now I have done this and I get a vary value:
byte Readspanning1 = SPI.transfer(0x05); // read spanning
byte Readspanning2 = SPI.transfer(0x01); // nop
byte Readspanning3 = SPI.transfer(0x01); // nop
digitalWrite(slaveSelectPin,HIGH);
Serial.print(" spanning = ");
Serial.print(Readspanning2);
Serial.print(" spanning1 = ");
Serial.print(Readspanning3);
}