diff --git a/include/libdivecomputer/hw_ostc3.h b/include/libdivecomputer/hw_ostc3.h
index bc56a9d..c60dc63 100644
--- a/include/libdivecomputer/hw_ostc3.h
+++ b/include/libdivecomputer/hw_ostc3.h
@@ -40,6 +40,9 @@ hw_ostc3_device_open (dc_device_t **device, dc_context_t *context, const char *n
 dc_status_t
 hw_ostc3_device_version (dc_device_t *device, unsigned char data[], unsigned int size);
 
+dc_status_t
+hw_ostc3_device_hardware (dc_device_t *device, unsigned char data[], unsigned int size);
+
 dc_status_t
 hw_ostc3_device_clock (dc_device_t *device, const dc_datetime_t *datetime);
 
diff --git a/src/descriptor.c b/src/descriptor.c
index c474e35..cf989e2 100644
--- a/src/descriptor.c
+++ b/src/descriptor.c
@@ -210,9 +210,9 @@ static const dc_descriptor_t g_descriptors[] = {
 	{"Heinrichs Weikamp", "OSTC 2N",  DC_FAMILY_HW_OSTC, 2},
 	{"Heinrichs Weikamp", "OSTC 2C",  DC_FAMILY_HW_OSTC, 3},
 	{"Heinrichs Weikamp", "Frog",     DC_FAMILY_HW_FROG, 0},
-	{"Heinrichs Weikamp", "OSTC 3",   DC_FAMILY_HW_OSTC3, 0},
-	{"Heinrichs Weikamp", "OSTC cR",  DC_FAMILY_HW_OSTC3, 0},
-	{"Heinrichs Weikamp", "OSTC Sport", DC_FAMILY_HW_OSTC3, 1},
+	{"Heinrichs Weikamp", "OSTC 3",     DC_FAMILY_HW_OSTC3, 0x0A},
+	{"Heinrichs Weikamp", "OSTC cR",    DC_FAMILY_HW_OSTC3, 0x05},
+	{"Heinrichs Weikamp", "OSTC Sport", DC_FAMILY_HW_OSTC3, 0x12},
 	/* Cressi Edy */
 	{"Cressi", "Edy", DC_FAMILY_CRESSI_EDY, 0},
 	/* Cressi Leonardo */
diff --git a/src/hw_ostc3.c b/src/hw_ostc3.c
index f280eaf..a5f96bf 100644
--- a/src/hw_ostc3.c
+++ b/src/hw_ostc3.c
@@ -46,6 +46,7 @@
 #define SZ_DISPLAY    16
 #define SZ_CUSTOMTEXT 60
 #define SZ_VERSION    (SZ_CUSTOMTEXT + 4)
+#define SZ_HARDWARE   1
 #define SZ_MEMORY     0x200000
 #define SZ_CONFIG     4
 #define SZ_FIRMWARE   0x01E000        // 120KB
@@ -66,6 +67,7 @@
 #define CUSTOMTEXT 0x63
 #define DIVE       0x66
 #define IDENTITY   0x69
+#define HARDWARE   0x6A
 #define DISPLAY    0x6E
 #define READ       0x72
 #define WRITE      0x77
@@ -73,6 +75,10 @@
 #define INIT       0xBB
 #define EXIT       0xFF
 
+#define OSTC3      0x0A
+#define SPORT      0x12
+#define CR         0x05
+
 typedef enum hw_ostc3_state_t {
 	OPEN,
 	DOWNLOAD,
@@ -461,6 +467,30 @@ hw_ostc3_device_version (dc_device_t *abstract, unsigned char data[], unsigned i
 }
 
 
+dc_status_t
+hw_ostc3_device_hardware (dc_device_t *abstract, unsigned char data[], unsigned int size)
+{
+	hw_ostc3_device_t *device = (hw_ostc3_device_t *) abstract;
+
+	if (!ISINSTANCE (abstract))
+		return DC_STATUS_INVALIDARGS;
+
+	if (size != SZ_HARDWARE)
+		return DC_STATUS_INVALIDARGS;
+
+	dc_status_t rc = hw_ostc3_device_init (device, DOWNLOAD);
+	if (rc != DC_STATUS_SUCCESS)
+		return rc;
+
+	// Send the command.
+	rc = hw_ostc3_transfer (device, NULL, HARDWARE, NULL, 0, data, size);
+	if (rc != DC_STATUS_SUCCESS)
+		return rc;
+
+	return DC_STATUS_SUCCESS;
+}
+
+
 static dc_status_t
 hw_ostc3_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, void *userdata)
 {
@@ -483,14 +513,26 @@ hw_ostc3_device_foreach (dc_device_t *abstract, dc_dive_callback_t callback, voi
 		return rc;
 	}
 
+	// Download the hardware descriptor.
+	unsigned char hardware[SZ_HARDWARE] = {0};
+	rc = hw_ostc3_device_hardware (abstract, hardware, sizeof (hardware));
+	if (rc != DC_STATUS_SUCCESS && rc != DC_STATUS_UNSUPPORTED) {
+		ERROR (abstract->context, "Failed to read the hardware descriptor.");
+		return rc;
+	}
+
 	// Emit a device info event.
 	dc_event_devinfo_t devinfo;
 	devinfo.firmware = array_uint16_be (id + 2);
 	devinfo.serial = array_uint16_le (id + 0);
-	if (devinfo.serial > 10000)
-		devinfo.model = 1; // OSTC Sport
-	else
-		devinfo.model = 0; // OSTC3
+	devinfo.model = hardware[0];
+	if (devinfo.model == 0) {
+		// Fallback to the serial number.
+		if (devinfo.serial > 10000)
+			devinfo.model = SPORT;
+		else
+			devinfo.model = OSTC3;
+	}
 	device_event_emit (abstract, DC_EVENT_DEVINFO, &devinfo);
 
 	// Allocate memory.
diff --git a/src/libdivecomputer.symbols b/src/libdivecomputer.symbols
index f27f6fd..732bb85 100644
--- a/src/libdivecomputer.symbols
+++ b/src/libdivecomputer.symbols
@@ -155,6 +155,7 @@ hw_frog_device_display
 hw_frog_device_customtext
 hw_ostc3_device_open
 hw_ostc3_device_version
+hw_ostc3_device_hardware
 hw_ostc3_device_clock
 hw_ostc3_device_display
 hw_ostc3_device_customtext