diff --git a/hardware/common/dmm/metex14.c b/hardware/common/dmm/metex14.c
index 7f4b8905..8ba42913 100644
--- a/hardware/common/dmm/metex14.c
+++ b/hardware/common/dmm/metex14.c
@@ -61,6 +61,10 @@ static int parse_value(const uint8_t *buf, float *result)
 	is_ol += (!strcasecmp((const char *)&valstr, "O.L")) ? 1 : 0;
 	is_ol += (!strcasecmp((const char *)&valstr, "OL.")) ? 1 : 0;
 	is_ol += (!strcasecmp((const char *)&valstr, "OL")) ? 1 : 0;
+	is_ol += (!strcasecmp((const char *)&valstr, "-.OL")) ? 1 : 0;
+	is_ol += (!strcasecmp((const char *)&valstr, "-O.L")) ? 1 : 0;
+	is_ol += (!strcasecmp((const char *)&valstr, "-OL.")) ? 1 : 0;
+	is_ol += (!strcasecmp((const char *)&valstr, "-OL")) ? 1 : 0;
 	if (is_ol != 0) {
 		sr_spew("Over limit.");
 		*result = INFINITY;