diff --git a/tests/xvf3800_probe.py b/tests/xvf3800_probe.py
new file mode 100644
index 0000000..4de7a96
--- /dev/null
+++ b/tests/xvf3800_probe.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+import argparse
+import time
+
+import numpy as np
+import sounddevice as sd
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--device",
+        help="Exact input device name to test (as shown by --list-input-devices)",
+        required=True,
+    )
+    parser.add_argument(
+        "--samplerate",
+        type=float,
+        default=16000.0,
+        help="Sample rate to test (default: 16000)",
+    )
+    parser.add_argument(
+        "--seconds",
+        type=float,
+        default=2.0,
+        help="Duration to record for debug (default: 2s)",
+    )
+    args = parser.parse_args()
+
+    print("=== sounddevice.query_devices() (input subset) ===")
+    devices = sd.query_devices()
+    for idx, dev in enumerate(devices):
+        if dev["max_input_channels"] > 0:
+            flag = "*" if args.device in (dev["name"], str(idx)) else " "
+            print(
+                f"{flag} [{idx}] {dev['name']} "
+                f"(max_input_channels={dev['max_input_channels']}, "
+                f"default_samplerate={dev['default_samplerate']})"
+            )
+
+    print("\n=== Opening stream ===")
+    sd.default.samplerate = args.samplerate
+    sd.default.dtype = "int16"
+
+    # Allow using either index or full name
+    device = args.device
+    try:
+        device = int(args.device)
+    except ValueError:
+        pass
+
+    # First just open/close the stream to see what PortAudio says
+    with sd.InputStream(device=device, channels=0) as stream:
+        print(f"Opened stream with device={device}")
+        print(f"  samplerate: {stream.samplerate}")
+        print(f"  channels:   {stream.channels}")
+        print(f"  dtype:      {stream.dtype}")
+        print(f"  blocksize:  {stream.blocksize}")
+
+    # Now actually record a short block and inspect the shape
+    print("\n=== Recording test block ===")
+    duration = args.seconds
+    num_frames = int(duration * args.samplerate)
+    print(f"Recording {duration} seconds ({num_frames} frames)...")
+
+    recorded = sd.rec(frames=num_frames, samplerate=args.samplerate,
+                      channels=0, dtype="int16", device=device)
+    sd.wait()
+
+    arr = np.array(recorded)
+    print(f"Recorded array shape: {arr.shape}, dtype={arr.dtype}")
+    if arr.ndim == 1:
+        print("-> Mono (1D) array returned")
+    elif arr.ndim == 2:
+        print(f"-> Multichannel: {arr.shape[1]} channels")
+    else:
+        print("-> Unexpected ndim:", arr.ndim)
+
+    print(f"Sample min/max: {arr.min()} / {arr.max()}")
+
+
+if __name__ == "__main__":
+    main()