diff --git a/tests/measure.py b/tests/measure.py
index d79ccf0..84f80c3 100755
--- a/tests/measure.py
+++ b/tests/measure.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-from time import sleep
+from time import sleep,time 
 from sys import exit
 import minimalmodbus
 import serial
@@ -35,5 +35,5 @@ while True:
     T_SCD4x_signed_addr = 15
     T_SCD4x_signed = instrument.read_register(T_SCD4x_signed_addr, 1, functioncode=4, signed=True)
     with open(log_file, 'a+') as f:
-        f.write(f'{CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
+        f.write(f'{int(time())} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
     sleep(10)
diff --git a/tests/measure_multiple_devices.py b/tests/measure_multiple_devices.py
index 90e41a7..e2a6001 100755
--- a/tests/measure_multiple_devices.py
+++ b/tests/measure_multiple_devices.py
@@ -37,6 +37,7 @@ while True:
             with open(f'measurement_device_{slave_address}.csv', 'a+') as f:
                 f.write(f'{time():.1f} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
         except minimalmodbus.NoResponseError:
-            print(f'Read error for device {slave_address} at {time()}')
+            with open('measure.log', 'a+') as logfile:
+            logfile.write(f'Read error for device {slave_address} at {time()}\n')
             continue
     sleep(10)