4 Pack Vacuum Cleaner HEPA Filters for Cyclonic Series RO3753EA RO3731EA RO3786EA 1、【5in1 Chlorine Meter】: Multi-function water quality tester for measuring pH, ORP, chlorine, H2, and temperature in swimming pools. Accurately measures the residual chlorine levels to keep pool or spa chlorine levels within safety limits. 2、【Highly Sensitive Probe】: Adopts highly sensitive electrode probe, plug-in design, removable and replaceable. Convenient operation, just put the probe into the water for a few seconds, easy to measure the value of Chlorine, PH, ORP, HA2, TEMP. Measurement data is more accurate. 3、【High Accuracy】: Temperature measurement design also has an automatic temperature compensation function, which can ensure the most accurate measurement for you in the ambient temperature ranges. ℃/°F unit conversion. 4、【Multifunctional Design】: Large LCD display with backlight function, you can see the measurement data clearly. Support data hold, one button to lock reading function, you can check the data at any time. With automatic calibration, you can restore the measurement accuracy by yourself. 5、【Wide Applications】: Suitable for drinking water, aquaculture, fish tanks, modern agriculture, wastewater treatments, river water quality tests, etc. It can also be used to measure the chlorine content in swimming pools, spas, and hot springs.<br> Multifunctional water quality tester for measuring PH, ORP, chlorine, H2, and temperature in swimming pools. Suitable for drinking water, aquaculture, fish tanks, modern agriculture, wastewater treatments, river water quality test, etc. It can also be used to measure the Chlorine content in Swimming Pool, Spa, Hot Spring.<br> Features:<br> 【5in1 Chlorine Meter】: Multi-function water quality tester for measuring pH,  ORP, chlorine, H2, and temperature in swimming pools. Accurately measures the residual chlorine levels to keep pool or spa chlorine levels within safety limits.<br> 【Highly Sensitive Probe】: Adopts highly sensitive electrode probe, plug-in design, removable and replaceable. Convenient operation, just put the probe into the water for a few seconds, easy to measure the value of Chlorine, PH, ORP, HA2, TEMP. Measurement data is more accurate.<br> 【High Accuracy】: Temperature measurement design also has an automatic temperature compensation function, which can ensure the most accurate measurement for you in the ambient temperature ranges. ℃/°F unit conversion.<br> 【Multifunctional Design】: Large LCD display with backlight function, you can see the measurement data clearly. Support data hold, one button to lock reading function, you can check the data at any time. With automatic calibration, you can restore the measurement accuracy by yourself.<br> 【Wide Applications】: Suitable for drinking water, aquaculture, fish tanks, modern agriculture, wastewater treatments, river water quality tests, etc. It can also be used to measure the chlorine content in swimming pools, spas, and hot springs.<br> Note: All readings are taken after automatic temperature compensation.<br> Specifications:<br> Name: 5in1 Chlorine Meter<br> Material: ABS<br> Battery: 3 * 1.5V button cells (not included)<br> PH test ranges: 0.00-14.00ph<br> ORP test ranges: 0.00-1999mv<br> CL test ranges: 0-4mg/L<br> H2 test ranges: 0-10000ppb<br> Temperature test ranges: 0℃-60℃/32℉-140℉<br> Item size: 186 * 38 * 23mm / 7.32 * 1.50 * 0.91in<br> Package size: 210 * 80 * 50mm / 8.27 * 3.15 * 1.97in<br> Package weight: 160g / 5.64ounce<br> Packing List:<br> 1 * 5in1 Chlorine Meter<br> Packing List:<br> 1 * 5in1 Chlorine Meter