The DeFelsko PosiTector 6000 Cabled 90° Regular Probe Only is a right angle probe for measuring within areas of low headroom. These constant-pressure, stainless steel probes are hermetically sealed to be totally waterproof - ideal for underwater use. Certificate of Calibration (Long Form) traceable to NIST or PTB included with every probe. Each probe retains its own unique calibration information (allowing full probe interchangeability).