diff --git a/src/parser.c b/src/parser.c
index 98d2c89..9fdb1a9 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -149,10 +149,10 @@ dc_parser_new_internal (dc_parser_t **out, dc_context_t *context, dc_family_t fa
 		rc = atomics_cobalt_parser_create (&parser, context);
 		break;
 	case DC_FAMILY_SHEARWATER_PREDATOR:
-		rc = shearwater_predator_parser_create (&parser, context);
+		rc = shearwater_predator_parser_create (&parser, context, model);
 		break;
 	case DC_FAMILY_SHEARWATER_PETREL:
-		rc = shearwater_petrel_parser_create (&parser, context);
+		rc = shearwater_petrel_parser_create (&parser, context, model);
 		break;
 	case DC_FAMILY_DIVERITE_NITEKQ:
 		rc = diverite_nitekq_parser_create (&parser, context);
diff --git a/src/shearwater_petrel.h b/src/shearwater_petrel.h
index 8b927d6..c23bb74 100644
--- a/src/shearwater_petrel.h
+++ b/src/shearwater_petrel.h
@@ -34,7 +34,7 @@ dc_status_t
 shearwater_petrel_device_open (dc_device_t **device, dc_context_t *context, const char *name);
 
 dc_status_t
-shearwater_petrel_parser_create (dc_parser_t **parser, dc_context_t *context);
+shearwater_petrel_parser_create (dc_parser_t **parser, dc_context_t *context, unsigned int model);
 
 #ifdef __cplusplus
 }
diff --git a/src/shearwater_predator.h b/src/shearwater_predator.h
index f21d445..4665f80 100644
--- a/src/shearwater_predator.h
+++ b/src/shearwater_predator.h
@@ -34,7 +34,7 @@ dc_status_t
 shearwater_predator_device_open (dc_device_t **device, dc_context_t *context, const char *name);
 
 dc_status_t
-shearwater_predator_parser_create (dc_parser_t **parser, dc_context_t *context);
+shearwater_predator_parser_create (dc_parser_t **parser, dc_context_t *context, unsigned int model);
 
 #ifdef __cplusplus
 }
diff --git a/src/shearwater_predator_parser.c b/src/shearwater_predator_parser.c
index 7c36651..58d1704 100644
--- a/src/shearwater_predator_parser.c
+++ b/src/shearwater_predator_parser.c
@@ -48,10 +48,14 @@
 
 #define NGASMIXES 10
 
+#define PREDATOR 2
+#define PETREL   3
+
 typedef struct shearwater_predator_parser_t shearwater_predator_parser_t;
 
 struct shearwater_predator_parser_t {
 	dc_parser_t base;
+	unsigned int model;
 	unsigned int petrel;
 	unsigned int samplesize;
 	// Cached fields.
@@ -106,7 +110,7 @@ shearwater_predator_find_gasmix (shearwater_predator_parser_t *parser, unsigned
 
 
 static dc_status_t
-shearwater_common_parser_create (dc_parser_t **out, dc_context_t *context, unsigned int petrel)
+shearwater_common_parser_create (dc_parser_t **out, dc_context_t *context, unsigned int model, unsigned int petrel)
 {
 	shearwater_predator_parser_t *parser = NULL;
 	const dc_parser_vtable_t *vtable = NULL;
@@ -131,6 +135,7 @@ shearwater_common_parser_create (dc_parser_t **out, dc_context_t *context, unsig
 	}
 
 	// Set the default values.
+	parser->model = model;
 	parser->petrel = petrel;
 	parser->samplesize = samplesize;
 	parser->cached = 0;
@@ -150,16 +155,16 @@ shearwater_common_parser_create (dc_parser_t **out, dc_context_t *context, unsig
 
 
 dc_status_t
-shearwater_predator_parser_create (dc_parser_t **out, dc_context_t *context)
+shearwater_predator_parser_create (dc_parser_t **out, dc_context_t *context, unsigned int model)
 {
-	return shearwater_common_parser_create (out, context, 0);
+	return shearwater_common_parser_create (out, context, model, 0);
 }
 
 
 dc_status_t
-shearwater_petrel_parser_create (dc_parser_t **out, dc_context_t *context)
+shearwater_petrel_parser_create (dc_parser_t **out, dc_context_t *context, unsigned int model)
 {
-	return shearwater_common_parser_create (out, context, 1);
+	return shearwater_common_parser_create (out, context, model, 1);
 }
 
 
@@ -290,9 +295,11 @@ shearwater_predator_parser_cache (shearwater_predator_parser_t *parser)
 	// to 70mV in 100% O2 at 1 atmosphere.
 	// If we add 1024 (1000?) to the calibration value, then the sensors
 	// lines up and matches the average.
-	parser->calibration[0] += 1024;
-	parser->calibration[1] += 1024;
-	parser->calibration[2] += 1024;
+	if (parser->model == PREDATOR) {
+		parser->calibration[0] += 1024;
+		parser->calibration[1] += 1024;
+		parser->calibration[2] += 1024;
+	}
 
 	// Cache the data for later use.
 	parser->headersize = headersize;