diff --git a/src/actipy/reader.py b/src/actipy/reader.py
index 1c8138f..d5ba60e 100644
--- a/src/actipy/reader.py
+++ b/src/actipy/reader.py
@@ -91,6 +91,9 @@ def read_device(input_file,
             data, info_resample = P.resample(data, resample_hz)
         info.update(info_resample)
         timer.stop()
+        
+    info_wear_coverage = calculate_wear_coverage(data)
+    info.update(info_wear_coverage)
 
     return data, info
 
@@ -405,6 +408,19 @@ def fix_nonincr_time(data):
     return data, errs
 
 
+def calculate_wear_coverage(data):
+    """ Check device wear covers all 24 hours of the day """
+    info = {}
+    coverage = data.groupby(data.index.hour).agg(lambda x: x.notna().mean())
+    
+    if len(coverage) < 24 or np.min(coverage) < 0.01:
+        info['Covers24hOK'] = 0
+    else:
+        info['Covers24hOK'] = 1
+    
+    return info
+
+
 class Timer:
     def __init__(self, verbose=True):
         self.verbose = verbose
diff --git a/tests/test_all.py b/tests/test_all.py
index 2a9dcf4..5d6dbde 100644
--- a/tests/test_all.py
+++ b/tests/test_all.py
@@ -25,7 +25,8 @@ def test_read_device():
         "EndTime": '2023-06-08 15:19:33',
         "NumTicks": 1021800,
         "WearTime(days)": 0.1211432638888889,
-        "NumInterrupts": 1
+        "NumInterrupts": 1,
+        "Covers24hOK": 0
     }
     assert_dict_equal(info, info_ref, rel=0.01)