TURBIDITY METER Instruments sense turbidity level of sample and automatically adjust to the appropriate measurement range. Calibration alert automatically prompts operator when instrument needs to be calibrated. A push of a button is all that is required to calibrate unit and ensure accurate readings. A serial printer or data recorder can be used to record date, time and NTU reading. Reusable calibration standards provide quick and easy calibration without the need to mix formazin. Optional pour-through assembly ( 9591F13) saves time by allowing grab sample to be poured through the sample chamber. Model 9591F04 Turbidimeter has an infrared light source that meets international standard ISO 7027 for turbidity measurement. Micro 100 Turbidimeters include a set of calibration standards ( 0.02, 10 and 1, 000 NTU) , two measuring cuvettes with light shield caps, operator’ s manual and a plug-in power adapter. Standard Features:  Auto Ranging 0 - 1000 NTU - Instrument senses turbidity level of sample and automatically adjusts to the appropriate measurement. Auto Alert Calibration Prompt - Automatically prompts the operator when calibration of the instrument is needed. Simple Calibration Procedures - Calibration initiated with the push of a button ensures accurate readings. RS-232 Output - Date, time, and NTU reading can be captured with a serial printer or data recorder. Optional Features:  Infrared Light Source ( Micro100 IR) Meets international standard ISO 7027 for turbidity measurement, OR White light source ( Micro100 WL) meets performance criteria specified by USEPA method 180.1 Pour-through assembly - save time by pouring your grab sample through the measurement chamber Reusable Calibration Standards - quick and easy calibration across all ranges without the need to mix Formazin