FIELDPIECE Wireless Large Pipe Clamp Temperature ProbeFIELDPIECE Wireless Large Pipe Clamp Temperature Probe JL3LC With the ability to measure pipes up to 104. 7 mm, the JL3LC wireless Clamp Temperature Probe is large and in chargea perfect match for any commercial or refrigeration HVAC R Technician in search of lightning fast precision readings without the inconvenience of straps, tape or zip ties. Our patented Rapid Rail Sensor Technology uses electrically conductive pipe to complete the circuit so