Concentrations vs StampReady

Concentrations is a powerful chemical calculator designed for laboratory professionals who need fast, accurate concentration calculations in the field. Say goodbye to manual dilution factor calculations, density conversions, and purity adjustments. The Problem We Solve: Ever needed to prepare a 1M sulfuric acid solution, but your stock bottle only shows "98% w/w" with molecular weight and density? Concentrations does the complex math for you instantly—just input your stock solution data and get precise preparation instructions with a single tap. Key Features: Smart Dilution Calculator – Calculate dilution parameters from stock solutions or known molar concentrations with ease Comprehensive Concentration Types – Support for Molar, Normal, Molal, Mole Fraction, Mass Concentration, Volume Fraction, and more Simple Input, Powerful Results – Enter your compound's molecular weight, desired concentration, and volume—Concentrations handles the rest Customizable Precision – Adjust decimal places in results to match your experimental requirements Localized Interface – Automatically adapts decimal indicators to your regional format Who It's For: Perfect for chemists, laboratory technicians, students, and researchers who need reliable concentration calculations without the hassle of manual computation. Stop fumbling with calculators and conversion tables. Get accurate results every time with Concentrations.

StampReady is the exam-prep app built by a licensed P.E. for engineers preparing to sit for the NCEES FE or PE. WHAT YOU GET - Timed practice tests with a pre-submit Review screen: tap any question in the grid to jump back, filter to your flagged or unanswered items, and submit when you are ready. - 5,400+ multiple-choice questions across 22 engineering disciplines, including PE Civil depths (Transportation, Structural, Geotechnical, Water Resources, Construction), PE Mechanical (HVAC, Thermal), PE Electrical Power, PE Environmental, PE Chemical, and all FE disciplines (Mechanical, Electrical/Computer, Chemical, Civil, Environmental, Industrial). - Flag questions during a session and come back to them later. Your marked items persist to your account, not just the session, and surface on your dashboard for focused review. - Readiness diagnostic that scores your weakest topics from a 30-question assessment and feeds them into a targeted study plan. - 50-state licensure checklist with direct links to your state board and to NCEES so you can see exactly what your state requires. - Real-time "weeks to exam" countdown that keeps you on pace. EVERY QUESTION IS VETTED Every multiple-choice question in this iOS app is forward-derived from the published reference handbooks (we compute a realistic numeric answer first, then write the stem around it, never back-fit). PRIVACY Anonymous product analytics. You own your practice history, and you can delete your account from the Profile screen at any time. Questions? Tap Support in-app or visit stampready.app/support.