Call us to order the Handheld TDS meter for Spectra watermakers. We also recommend this product for any other watermaker or if you have a water sample you would like to have tested on the fly! The tester reads 0-9999 ppm. The test meter also reads the temperature of the water and has a hold feature. Call 1.800.958.6001 to speak to a professional. You can also e-mail us at email@example.com with questions that you may have!