diff --git a/check_tl500.py b/check_tl500.py
new file mode 100755
index 0000000..4b80363
--- /dev/null
+++ b/check_tl500.py
@@ -0,0 +1,97 @@
+#!/usr/bin/python
+# -*- encoding: utf-8 -*-
+
+from monitoringplugin import MonitoringPlugin
+
+import time
+import os
+import re
+
+plugin = MonitoringPlugin(pluginname='check_tl500', tagforstatusline='TL500', description='Check TL500 environment sensors', version='0.1')
+
+plugin.add_cmdlineoption('-s', '', 'sensorid', '(comma separated list of) sensor id(s), no spaces', default=None)
+plugin.add_cmdlineoption('-m', '', 'maxage', 'maximum age of data files (default: 600 seconds/10 minutes)', type="int", default=600)
+plugin.add_cmdlineoption('-p', '', 'path', 'path to data files', default='/tmp')
+plugin.add_cmdlineoption('-w', '', 'tempwarn', 'warning thresold for temperature sensors', default=None)
+plugin.add_cmdlineoption('-c', '', 'tempcrit', 'critical thresold for temperature sensors', default=None)
+plugin.add_cmdlineoption('-W', '', 'humwarn', 'warning thresold for humidity sensors', default=None)
+plugin.add_cmdlineoption('-C', '', 'humcrit', 'critical thresold for humidity sensors', default=None)
+
+plugin.parse_cmdlineoptions()
+
+# No sensor id
+if not plugin.options.sensorid:
+	plugin.back2nagios(3, 'Need at least one sensor id!')
+
+# Make list of sensor ids
+if ',' in plugin.options.sensorid:
+	plugin.options.sensorid = plugin.options.sensorid.split(',')
+else:
+	plugin.options.sensorid = [plugin.options.sensorid,]
+
+# Convert all sensor ids to long
+for idx in xrange(len(plugin.options.sensorid)):
+	try:
+		plugin.options.sensorid[idx] = long(plugin.options.sensorid[idx])
+	except ValueError:
+		plugin.back2nagios(3, 'Sensor id "%s" must be numeric!' % plugin.options.sensorid[idx])
+
+plugin.options.sensorid.sort()
+plugin.verbose(1, 'Sensor id(s): ' + ' - '.join([str(s) for s in plugin.options.sensorid]))
+
+searchpattern = re.compile(r'(....-..-.. ..:..:..)\s+Sensor:\s*([0-9]+)\s+Raw:\s*(-?[0-9]+)\s+Value:\s*(-?[0-9\.]+)\s+Unit:\s*(...?)$')
+
+for sensorid in plugin.options.sensorid:
+	filename = os.path.join(plugin.options.path, 'tl-500_%s' % sensorid)
+	try:
+		plugin.verbose(3, 'Reading sensor %s' % sensorid)
+		data = file(filename).read().lstrip().rstrip()
+	except IOError:
+		plugin.back2nagios(3, 'Could not read file "%s"' % filename)
+
+	plugin.verbose(2, 'Read line: %s' % data)
+
+	plugin.verbose(2, 'Checking age of file')
+	fileage = time.time() - os.path.getmtime(filename)
+	if fileage > plugin.options.maxage:
+		plugin.add_output('Data of sensor "%s" to old' % sensorid)
+		plugin.add_returncode(3)
+		plugin.verbose(2, 'File to old, age: %s but only %s seconds allowed'% (long(fileage), plugin.options.maxage))
+	else:
+		plugin.verbose(2, 'File age OK, age: %s and %s seconds are allowed'% (long(fileage), plugin.options.maxage))
+	
+		result = searchpattern.search(data)
+		if result:
+			sensor_type = None
+			(readtime, sid, raw, value, unit) = result.groups()
+
+			if unit == '\xc2\xb0C':
+				sensor_type = 'temp'
+				sensor_name = 'temp_' + str(sensorid)
+				warn = plugin.options.tempwarn
+				crit = plugin.options.tempcrit
+				unit = 'C'
+				pdunit = ''
+			elif unit == '%RH':
+				sensor_type = 'hum'
+				sensor_name = 'hum_' + str(sensorid)
+				warn = plugin.options.humwarn
+				crit = plugin.options.humcrit
+				pdunit = '%'
+
+			if sensor_type:
+				returncode = plugin.value_wc_to_returncode(float(value), warn, crit)
+				if returncode == 0:
+					plugin.add_output('%s: %s%s' % (sensor_name, value, unit))
+				else:
+					plugin.add_output('%s: %s %s%s' % (sensor_name, plugin.RETURNSTRINGS[returncode], value, unit))
+				plugin.add_returncode(returncode)
+				plugin.add_multilineoutput('%s %s: %s%s (%s)' % (sensor_name, plugin.RETURNSTRINGS[returncode], value, unit, readtime))
+				plugin.format_add_performancedata(sensor_name, value, pdunit, warn=warn, crit=crit)
+			else:
+				plugin.verbose(1, 'Unknown sensor type "%s" on %s' % (unit, sensorid))
+		else:
+			plugin.verbose(2, 'No data found for sensor %s' % sensorid)
+
+plugin.exit()
+