diff --git a/hardware/abstract_hardware.py b/hardware/abstract_hardware.py
index 47bf1771c69525ba2e03d14fc1a3f5c1d8cf3510..9db4a787a2a3a3dba7e3c093096ff9b89292648d 100644
--- a/hardware/abstract_hardware.py
+++ b/hardware/abstract_hardware.py
@@ -27,7 +27,7 @@ class TxAbstract(ABC):
         #self._polarity = polarity
         self._inj_time = None
         self._dps_state = 'off'
-        self.adc_gain = 1.
+        self._adc_gain = 1.
         self.polarity = polarity
         self.inj_time = inj_time
         self.exec_logger.debug(f'{self.board_name} TX initialization')
diff --git a/hardware/ohmpi_card_3_15.py b/hardware/ohmpi_card_3_15.py
index 184c27d4fcd2e6a59d7a04bc23a51bc6c829037b..c5f3874c0783d56d26292bed3676bbd0e45f1fe1 100644
--- a/hardware/ohmpi_card_3_15.py
+++ b/hardware/ohmpi_card_3_15.py
@@ -73,7 +73,7 @@ class Tx(TxAbstract):
         self.mcp_board = MCP23008(self.controller.bus, address=TX_CONFIG['mcp_board_address'])
 
         # ADS1115 for current measurement (AB)
-        self._adc_gain = 2/3
+        self.adc_gain = 2/3
         self._ads_current_address = 0x48
         self._ads_current = ads.ADS1115(self.controller.bus, gain=self.adc_gain, data_rate=860,
                                         address=self._ads_current_address)