diff --git a/pyproject.toml b/pyproject.toml
index fc951ee..2c32836 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "oslg"
-version = "0.3.3"
+version = "0.4.0"
 description = "OpenStudio SDK logger for Python"
 readme = "README.md"
 requires-python = ">=3.2"
diff --git a/src/oslg/oslg.py b/src/oslg/oslg.py
index ca2d1f9..eb7faad 100644
--- a/src/oslg/oslg.py
+++ b/src/oslg/oslg.py
@@ -74,31 +74,31 @@ class _CN:
 _status = 0
 
 
-def trim(txt="", length=160) -> str:
+def trim(txt="", sz=None) -> str:
     """
     Converts an object to a string. Strips if necessary.
 
     Args:
         txt (str):
             An object.
-        length (int):
-            Desired maximum string length (max 160).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         str: Stripped, trimmed string.
-        "": If 'length' cannot be converted to an integer.
         "": If 'txt' cannot be converted to a valid string.
 
     """
     try:
-        length = int(length)
+        txt = str(txt).strip()
     except:
-        length = 160
+        txt = ""
 
     try:
-        txt = str(txt).strip()[:length]
+        sz = int(sz)
+        if len(txt) > sz: txt = txt[:sz] + " ..."
     except:
-        txt = ""
+        pass
 
     return txt
 
@@ -217,7 +217,7 @@ def reset(lvl=CN.DEBUG) -> int:
     return _level
 
 
-def log(lvl=CN.DEBUG, message="", length=160) -> int:
+def log(lvl=CN.DEBUG, message="", sz=None) -> int:
     """
     Logs a new entry. Overall log status is raised if new level is greater
     (e.g. FATAL > ERROR). Candidate log entry is ignored and status remains
@@ -230,8 +230,8 @@ def log(lvl=CN.DEBUG, message="", length=160) -> int:
             Selected log level (e.g. CN.DEBUG).
         message (str):
             Selected log message.
-        length (int):
-            Selected log message length (max 160 chars).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Current log status, potentially raised.
@@ -245,14 +245,7 @@ def log(lvl=CN.DEBUG, message="", length=160) -> int:
     except:
         return _status
 
-    try:
-        length = int(length)
-    except:
-        return _status
-
-    if length > 160: length = 160
-
-    message = trim(message, length)
+    message = trim(message, sz)
 
     if not message or lvl < CN.DEBUG or lvl > CN.FATAL or lvl < _level:
         return _status
@@ -265,7 +258,7 @@ def log(lvl=CN.DEBUG, message="", length=160) -> int:
     return _status
 
 
-def invalid(id="", mth="", ord=0, lvl=CN.DEBUG, res=None):
+def invalid(id="", mth="", ord=0, lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'invalid object' entry, based on arguments. Relies on OSlg
     method 'log()': first check out its own operation, exit conditions and
@@ -284,6 +277,8 @@ def invalid(id="", mth="", ord=0, lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -311,12 +306,12 @@ def invalid(id="", mth="", ord=0, lvl=CN.DEBUG, res=None):
         msg += "arg #%d "  % (ord)
 
     msg += "(%s)" % (mth)
-    log(lvl, msg)
+    log(lvl, msg, sz)
 
     return res
 
 
-def mismatch(id="", obj=None, cl=None, mth="", lvl=CN.DEBUG, res=None):
+def mismatch(id="", obj=None, cl=None, mth="", lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'instance/class mismatch' entry, based on arguments. Relies
     on OSlg method 'log()': first check out its own operation, exit conditions
@@ -336,6 +331,8 @@ def mismatch(id="", obj=None, cl=None, mth="", lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -358,12 +355,12 @@ def mismatch(id="", obj=None, cl=None, mth="", lvl=CN.DEBUG, res=None):
 
     msg  = "'%s' %s? " % (id, type(obj).__name__)
     msg += "expecting %s (%s)" % (cl.__name__, mth)
-    log(lvl, msg)
+    log(lvl, msg, sz)
 
     return res
 
 
-def hashkey(id="", dct={}, key="", mth="", lvl=CN.DEBUG, res=None):
+def hashkey(id="", dct={}, key="", mth="", lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'missing hash key' entry, based on arguments. Relies on OSlg
     method 'log()': first check out its own operation, exit conditions and
@@ -383,6 +380,8 @@ def hashkey(id="", dct={}, key="", mth="", lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -404,12 +403,12 @@ def hashkey(id="", dct={}, key="", mth="", lvl=CN.DEBUG, res=None):
     if not isinstance(dct, dict): return res
     if key in dct:                return res
 
-    log(lvl, "Missing '%s' key in %s (%s)" % (ky, id, mth))
+    log(lvl, "Missing '%s' key in %s (%s)" % (ky, id, mth), sz)
 
     return res
 
 
-def empty(id="", mth="", lvl=CN.DEBUG, res=None):
+def empty(id="", mth="", lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'empty' entry, based on arguments. Relies on OSlg method
     'log()': first check out its own operation, exit conditions and module side
@@ -424,6 +423,8 @@ def empty(id="", mth="", lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -442,12 +443,12 @@ def empty(id="", mth="", lvl=CN.DEBUG, res=None):
     if lvl < CN.DEBUG: return res
     if lvl > CN.FATAL: return res
 
-    log(lvl, "Empty '%s' (%s)" % (id, mth))
+    log(lvl, "Empty '%s' (%s)" % (id, mth), sz)
 
     return res
 
 
-def zero(id="", mth="", lvl=CN.DEBUG, res=None):
+def zero(id="", mth="", lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'zero' entry, based on arguments. Relies on OSlg method
     'log()': first check out its own operation, exit conditions and module side
@@ -462,6 +463,8 @@ def zero(id="", mth="", lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -480,12 +483,12 @@ def zero(id="", mth="", lvl=CN.DEBUG, res=None):
     if lvl < CN.DEBUG: return res
     if lvl > CN.FATAL: return res
 
-    log(lvl, "Zero '%s' (%s)" % (id, mth))
+    log(lvl, "Zero '%s' (%s)" % (id, mth), sz)
 
     return res
 
 
-def negative(id="", mth="", lvl=CN.DEBUG, res=None):
+def negative(id="", mth="", lvl=CN.DEBUG, res=None, sz=None):
     """
     Logs template 'negative' entry, based on arguments. Relies on OSlg method
     'log()': first check out its own operation, exit conditions and module side
@@ -500,6 +503,8 @@ def negative(id="", mth="", lvl=CN.DEBUG, res=None):
             Selected log level (e.g. CN.DEBUG).
         res:
             Selected return object (e.g. 'False', None).
+        sz (int):
+            Selected maximum string length, or 'size' (optional).
 
     Returns:
         Selected return object ('res').
@@ -518,7 +523,7 @@ def negative(id="", mth="", lvl=CN.DEBUG, res=None):
     if lvl < CN.DEBUG: return res
     if lvl > CN.FATAL: return res
 
-    log(lvl, "Negative '%s' (%s)" % (id, mth))
+    log(lvl, "Negative '%s' (%s)" % (id, mth), sz)
 
     return res
 
diff --git a/tests/test_oslg.py b/tests/test_oslg.py
index 0480490..2ac658a 100644
--- a/tests/test_oslg.py
+++ b/tests/test_oslg.py
@@ -56,7 +56,7 @@ def test01_oslg_initialized(self):
         self.assertEqual(oslg.msg(FTL), "Failure, triggered fatal errors")
         self.assertNotEqual(oslg.msg(FTL), "Debugging ...")
         self.assertEqual(oslg.trim("   oslg  "), "oslg")
-        self.assertEqual(oslg.trim("   oslg  ", 3), "osl")
+        self.assertEqual(oslg.trim("   oslg  ", 3), "osl ...")
         self.assertEqual(oslg.trim("   oslg  ", 64), "oslg")
         self.assertEqual(oslg.reset(INF), INF)
         self.assertEqual(oslg.clean(), INF)
@@ -99,6 +99,30 @@ def test03_oslg_invalid_argument_log(self):
         self.assertEqual(oslg.clean(), INF)
         self.assertEqual(oslg.level(), INF)
 
+        # Longish error message, exceeding 160 chars.
+        a = str([i+1 for i in range(60)])
+        l1 = 3 * 9 # "1, " + "2, " + "3, " ...+ "9, "
+        l2 = 4 * (59 - 9) # "10, " + "11, " + 12, ...+ "59, "
+        l3 = 2 # "60"
+        l4 = 2 # "[]"
+        self.assertEqual(l1 + l2 + l3 + l4, 231)
+        self.assertEqual(len(a), l1 + l2 + l3 + l4)
+        self.assertEqual(oslg.mismatch("x", "String", list, a, FTL, None, 156), None)
+        self.assertEqual(oslg.status(), FTL)
+        str1 = "'x' str? expecting list "                        # 24 chars
+        str2 = "([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, "   # 45 chars
+        str3 = "14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, "    # 44 chars
+        str4 = "25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, ..." # 47 chars
+        str0 = str1 + str2 + str3 + str4
+        self.assertEqual(len(str0), 160) # 156 + " ..."
+        self.assertEqual(len(oslg.logs()[0]["message"]), len(str0))
+        self.assertEqual(oslg.logs()[0]["message"], str0)
+        self.assertEqual(oslg.level(), INF)
+        self.assertEqual(len(oslg.logs()), 1)
+        self.assertEqual(oslg.reset(INF), INF)
+        self.assertEqual(oslg.clean(), INF)
+        self.assertEqual(oslg.level(), INF)
+
     def test04_oslg_mismatched_argument_log(self):
         m1 = "'radius' str? expecting float (area)"
         m2 = "'roster' list? expecting dict (index)"