{"product_id":"ut381pv","title":"UT381PV Solar Irradiance Meter","description":"\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe UT381PV is a handheld solar irradiance meter for PV installers and O\u0026amp;M crews. A silicon PV-cell sensor reads irradiance from 0 to 1400 W\/m² at ±(5.0% rdg + 5 dgts), and the same screen carries two temperatures, panel tilt and compass azimuth — the conditions a commissioning or performance check is judged against, taken at the module instead of from a weather feed.\u003c\/p\u003e\n\u003cp\u003eLay it flat on the module or clip it to the frame with the included bracket; a suction-cup probe on the backsheet adds a second temperature reading. The IP65, UV-resistant (F1) housing and 2 m drop rating suit rooftop and ground-mount work, 12,800 records log on board at intervals from 1 s to 60 min, and Bluetooth sends live readings to the iENV app for PDF\/CSV reports. It's backed by UNI-T's nearly 40 years of test-meter manufacturing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSolar irradiance 0–1400 W\/m² (0–500 Btu\/(ft²·h)), 1 W\/m² resolution, ±(5.0% rdg + 5 dgts) — natural or simulated sunlight\u003c\/li\u003e\n\u003cli\u003eTwo temperatures on screen together: built-in rear sensor (T1) and suction-cup probe (T2), −40 to 120 °C, ±1 °C from −10 to 75 °C\u003c\/li\u003e\n\u003cli\u003eBuilt-in inclination sensor, −90.0° to +90.0°, ±1.5° within ±50°, with zero reset for pitched roofs\u003c\/li\u003e\n\u003cli\u003eCompass azimuth 0–360°, ±7° with the meter held within 20° of level; field calibration\u003c\/li\u003e\n\u003cli\u003eAudible and visual tilt alarm against a set inclination limit\u003c\/li\u003e\n\u003cli\u003e12,800-record memory, 1 s to 60 min recording interval, loop or stop-when-full\u003c\/li\u003e\n\u003cli\u003eBluetooth to the iENV app (iOS and Android) up to 100 m in open line of sight — live view and PDF\/CSV export\u003c\/li\u003e\n\u003cli\u003eIP65 UV-resistant (F1) housing, 2 m drop rating, quick-release panel bracket\u003c\/li\u003e\n\u003cli\u003eTwo AA batteries, about 95 h with Bluetooth and LED off\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eUT381PV Details\u003c\/h2\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eIrradiance at the Module\u003c\/h3\u003e\n\u003cp\u003eThe silicon PV-cell sensor sits at the top of the meter, so the reading reflects the light arriving on the module plane when the meter lies on the glass or rides the included bracket at the frame edge. Irradiance reads 0 to 1400 W\/m² at 1 W\/m² resolution, or 0 to 500 Btu\/(ft²·h) at the press of the UNIT button.\u003c\/p\u003e\n\u003cp\u003eIt measures natural sunlight in the field and simulated sunlight in the lab, so the same meter can check a rooftop string at noon and the light level on a module test bench.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-on-array\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_on-array.jpg\" alt=\"UNI-T UT381PV lying on a large solar array\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eLaid flat on the module, the sensor reads the light on the panel plane.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-on-array\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_on-array.jpg\" alt=\"UNI-T UT381PV lying on a large solar array\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eLaid flat on the module, the sensor reads the light on the panel plane.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-probe\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_suction-probe-under-panel.jpg\" alt=\"UT381PV suction-cup temperature probe on the back of a solar module\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eT2: the suction-cup probe reads the backsheet.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eTwo Temperatures at Once\u003c\/h3\u003e\n\u003cp\u003eModule output falls as cell temperature rises, so an irradiance figure without a temperature beside it is half the story. The UT381PV shows both channels together: T1, the integrated sensor on the back of the meter, reads the panel surface when the meter sits on the module, and T2 reads the supplied suction-cup probe pressed to the backsheet.\u003c\/p\u003e\n\u003cp\u003eTemperature spans −40 to 120 °C (−40 to 248 °F) at 0.1 °C resolution, ±1 °C from −10 to 75 °C. Allow about 30 seconds for a temperature reading to settle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-probe\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_suction-probe-under-panel.jpg\" alt=\"UT381PV suction-cup temperature probe on the back of a solar module\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eT2: the suction-cup probe reads the backsheet.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eTilt and Azimuth from the Same Meter\u003c\/h3\u003e\n\u003cp\u003eA built-in inclination sensor reads −90.0° to +90.0° at 0.1° resolution, ±1.5° within ±50°. On a pitched roof, set the meter on the roof surface and hold UNIT for 2 seconds to zero it, then place it on the module to read the panel's tilt relative to the roof.\u003c\/p\u003e\n\u003cp\u003eThe compass reads azimuth 0 to 360°, ±7° with the meter held within 20° of level; tilt it further and the display shows \"---\". Steel racking, rails and the module frame pull a compass, so take the azimuth reading clear of the panel and any metal, pointing the tip the way the module faces. The compass indicates magnetic north and can be recalibrated in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-tilt-azimuth\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_display-tilt-azimuth.jpg\" alt=\"UT381PV display showing irradiance, inclination and azimuth\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eIrradiance, tilt and azimuth on one screen.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-tilt-azimuth\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_display-tilt-azimuth.jpg\" alt=\"UT381PV display showing irradiance, inclination and azimuth\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eIrradiance, tilt and azimuth on one screen.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-alarm\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_tilt-alarm-led.jpg\" alt=\"UT381PV tilt alarm LED lit\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eThe LED and buzzer flag an angle outside the set limit.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eTilt Alarm for Racking Checks\u003c\/h3\u003e\n\u003cp\u003eSet an inclination limit from the meter's menu or the app, and the UT381PV sounds its buzzer and flashes its three-color LED whenever the measured angle falls outside it. Working down a row of tables, the alarm flags an off-angle module without anyone reading the display.\u003c\/p\u003e\n\u003cp\u003eThe LED and buzzer can each be switched off for quiet or long-term logging work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-alarm\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_tilt-alarm-led.jpg\" alt=\"UT381PV tilt alarm LED lit\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eThe LED and buzzer flag an angle outside the set limit.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eLogging and the iENV App\u003c\/h3\u003e\n\u003cp\u003eThe meter stores 12,800 records at a recording interval you set from 1 second to 60 minutes, and it can either loop over the oldest data when memory fills or stop and hold what it has. Short intervals capture fast-moving cloud cover; long ones cover a day or more of site data.\u003c\/p\u003e\n\u003cp\u003eOver Bluetooth, the iENV app for iOS and Android shows live readings and trend charts, sets the recording interval, mode, alarm and tilt limit, and exports PDF or CSV reports. The link reaches up to 100 m in open line of sight. The UT381PV can also send its irradiance and temperature readings over Bluetooth to a compatible UNI-T PV I-V curve analyzer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-app\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_ienv-app.jpg\" alt=\"iENV mobile app showing UT381PV irradiance, temperature, direction and tilt\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eThe iENV app: live readings, trend and report export.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-app\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_ienv-app.jpg\" alt=\"iENV mobile app showing UT381PV irradiance, temperature, direction and tilt\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eThe iENV app: live readings, trend and report export.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-bracket\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_mounting-bracket-on-frame.jpg\" alt=\"UT381PV clamped to a solar module frame with the mounting bracket\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eThe quick-release bracket holds the meter at the module edge.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eBuilt for Rooftops and Racking\u003c\/h3\u003e\n\u003cp\u003eAn IP65 rating and a 2 m drop rating cover rain, dust and the occasional fall from a module table. The housing uses a specialized anti-UV (F1) material that resists the aging and cracking long sun exposure causes in ordinary plastics.\u003c\/p\u003e\n\u003cp\u003eThe quick-release bracket clamps the meter to a module frame for hands-free logging, and a 1\/4-inch threaded hole on the back takes standard mounting hardware. Two AA batteries run it for about 95 hours with Bluetooth and the LED off, and auto power-off after 30 minutes idle can be switched off for long recordings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-bracket\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_body_mounting-bracket-on-frame.jpg\" alt=\"UT381PV clamped to a solar module frame with the mounting bracket\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eThe quick-release bracket holds the meter at the module edge.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003ePV Installation, Commissioning and O\u0026amp;M\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRecord irradiance and module temperature at the moment an I-V curve, string or insulation test is taken, so results can be judged against the conditions they were measured in.\u003c\/li\u003e\n\u003cli\u003eVerify tilt and azimuth against the design drawings before racking is signed off, and use the tilt alarm to check a whole row quickly.\u003c\/li\u003e\n\u003cli\u003eLog irradiance through the day to separate a weather-driven drop in output from a fault.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-app-pv\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_pv-plant.jpg\" alt=\"Ground-mount solar array\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003ePV plant installation and maintenance.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-app-pv\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_pv-plant.jpg\" alt=\"Ground-mount solar array\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003ePV plant installation and maintenance.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-app-met\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_meteorological.jpg\" alt=\"Weather-monitoring masts in an open field\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eSite assessment and meteorological monitoring.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003ch3\u003eSite Assessment and Lab Testing\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLog irradiance on a prospective site at 1 s to 60 min intervals to support resource assessment before a system is built.\u003c\/li\u003e\n\u003cli\u003eCheck the light level on a module test bench or under a solar simulator, with the probe on the device under test.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-app-met\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_meteorological.jpg\" alt=\"Weather-monitoring masts in an open field\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eSite assessment and meteorological monitoring.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003cdiv class=\"product-row\"\u003e\n\u003cdiv class=\"product-box product-left\"\u003e\n\u003ch3\u003eAgricultural and Environmental Monitoring\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTrack sunlight and temperature in greenhouses, agrivoltaic plots and field research sites, with records exported to CSV for analysis.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-box product-right\"\u003e\n\u003cfigure class=\"product-figure\"\u003e\n\u003ca href=\"#lb-ut381pv-app-agri\" class=\"product-thumb-link\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_agri-greenhouse.jpg\" alt=\"Crops growing in a greenhouse\" class=\"product-image-thumb\"\u003e\n\u003c\/a\u003e\n\u003cfigcaption class=\"product-figcaption\"\u003eAgricultural and environmental monitoring.\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ca id=\"lb-ut381pv-app-agri\" href=\"#_\" class=\"product-lightbox\"\u003e\n\u003cspan class=\"lightbox-close\"\u003e×\u003c\/span\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UT381PV_app_agri-greenhouse.jpg\" alt=\"Crops growing in a greenhouse\"\u003e\n\u003cspan class=\"lightbox-caption\"\u003eAgricultural and environmental monitoring.\u003c\/span\u003e\n\u003c\/a\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eAccessories \u0026amp; In the Box\u003c\/h2\u003e\n\u003ch3\u003eIncluded\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUT381PV Solar Irradiance Meter\u003c\/li\u003e\n\u003cli\u003eSuction-cup temperature probe\u003c\/li\u003e\n\u003cli\u003eSolar panel mounting bracket\u003c\/li\u003e\n\u003cli\u003eCarrying bag\u003c\/li\u003e\n\u003cli\u003e2 × AA batteries\u003c\/li\u003e\n\u003cli\u003eUser manual, safety guide and download operation guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eWhat units does the UT381PV display?\u003c\/h3\u003e\n\u003cp\u003eIrradiance in W\/m² (0–1400) or Btu\/(ft²·h) (0–500), switched with the UNIT button. Temperature reads in °C or °F.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eCan I use it under a solar simulator?\u003c\/h3\u003e\n\u003cp\u003eYes. The UT381PV measures irradiance from natural or simulated sunlight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eWhy does the compass show \"---\"?\u003c\/h3\u003e\n\u003cp\u003eThe azimuth reading needs the meter within 20° of level. Hold it flat, away from the module frame, racking and other metal, with the tip pointing the way the panel faces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eHow do I measure panel tilt on a pitched roof?\u003c\/h3\u003e\n\u003cp\u003ePlace the meter on the roof surface and hold UNIT for 2 seconds to zero it, then set it on the module to read the panel's tilt relative to the roof.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eWhich app does it use?\u003c\/h3\u003e\n\u003cp\u003eiENV, on the App Store and Google Play. It connects over Bluetooth up to 100 m in open line of sight and exports PDF and CSV reports.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"UNI-T","offers":[{"title":"Default Title","offer_id":54690916663580,"sku":"180500300039X","price":350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/9208\/0924\/files\/UNI-T_UT381PV_1_sq_ce5de344-d45f-4bfd-8f96-6c6ce2a5f1cb.jpg?v=1791917150","url":"https:\/\/uni-trendus.com\/products\/ut381pv","provider":"Uni-Trend US","version":"1.0","type":"link"}