ATP-Dew-Point-Thermo-Hygrometer-ET-951-ATP-ET-951-P-The-ATP-ET-951-Dew-Point-Thermo-Hygrometer-is-compact-easy-to-use-&-robust-instrument-The-instrument-will-deliver-fast-accurate-&-repeatable-measurements-of-relative-humidity-air-temperature-&-dew-point-It-is-ideal-for-single-handed-operation-when-taking-measurements-in-air-stream-Suitable-for-monitoring-air-conditioning-&-heating-system-ducts-controlled-environments-storage-areas-&-other-critical-areas-P-ATP-ET-951-Dew