diff --git a/pyscada/influxdb/models.py b/pyscada/influxdb/models.py
index 307bae0..aa8caa5 100644
--- a/pyscada/influxdb/models.py
+++ b/pyscada/influxdb/models.py
@@ -107,13 +107,14 @@ class InfluxDatabase(models.Model):
         use_date_saved = (
             kwargs.pop("use_date_saved") if "use_date_saved" in kwargs else False
         )
-        query = f'from(bucket: "{self.bucket}") |> range(start: {self.to_flux_time(time_min)}) |> filter(fn:(r) => r._measurement == "{self.measurement_name}" ) |> filter(fn:(r) => r.variable_id == "{variable_id}") |> filter(fn:(r) => r._field == "value") |> keep(columns: ["_time","_value"]) |> last()'
-        r = query_api.query(query)
-        r = r.to_values(columns=['_time','_value'])[0]
+        start_time = "-24h"
+        query = f'from(bucket: "{self.bucket}") |> range(start: {start_time}) |> filter(fn:(r) => r._measurement == "{self.measurement_name}" ) |> filter(fn:(r) => r.variable_id == "{variable.pk}") |> filter(fn:(r) => r._field == "value") |> keep(columns: ["_time","_value"]) |> last()'
+        r = self.get_query_api().query(query)
+        r = r.to_values(columns=['_time','_value'])
 
         if len(r) == 0:
             return None
-        return [r[-1][0].timestamp(), r[-1][1]]
+        return [r[0][0].timestamp(), r[0][1]]
 
 
     def read_multiple(self, **kwargs):